Mercurial > hg > truffle
annotate graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/ConvertDeoptimizeToGuardPhase.java @ 7767:4a6646d8eb87
separate BooleanNode and ConstantNode hierarchy, rename BooleanNode to LogicNode and LogicNode to BitLogicNode
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Mon, 11 Feb 2013 15:55:27 +0100 |
parents | 0b646334c5f7 |
children | 53683dc2815e |
rev | line source |
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Added experimental ConvertDeoptimizeToGuardPhase.
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1 /* |
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2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.oracle.graal.phases.common; |
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24 |
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25 import java.util.*; |
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26 |
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27 import com.oracle.graal.debug.*; |
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28 import com.oracle.graal.graph.*; |
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29 import com.oracle.graal.nodes.*; |
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30 import com.oracle.graal.nodes.java.*; |
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31 import com.oracle.graal.nodes.util.*; |
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32 import com.oracle.graal.phases.*; |
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33 |
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34 public class ConvertDeoptimizeToGuardPhase extends Phase { |
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35 |
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36 private static BeginNode findBeginNode(Node startNode) { |
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37 Node n = startNode; |
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38 while (true) { |
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39 if (n instanceof BeginNode) { |
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40 return (BeginNode) n; |
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41 } else { |
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42 n = n.predecessor(); |
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43 } |
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44 } |
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45 } |
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46 |
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47 @Override |
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48 protected void run(final StructuredGraph graph) { |
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49 if (graph.getNodes(DeoptimizeNode.class).isEmpty()) { |
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50 return; |
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51 } |
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52 |
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53 for (DeoptimizeNode d : graph.getNodes(DeoptimizeNode.class)) { |
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54 visitDeoptBegin(findBeginNode(d), d, graph); |
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55 } |
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56 |
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57 new DeadCodeEliminationPhase().apply(graph); |
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58 } |
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59 |
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60 private void visitDeoptBegin(BeginNode deoptBegin, DeoptimizeNode deopt, StructuredGraph graph) { |
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61 if (deoptBegin instanceof MergeNode) { |
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62 MergeNode mergeNode = (MergeNode) deoptBegin; |
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63 Debug.log("Visiting %s followed by %s", mergeNode, deopt); |
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64 List<EndNode> ends = mergeNode.forwardEnds().snapshot(); |
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65 for (EndNode end : ends) { |
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66 if (!end.isDeleted()) { |
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67 BeginNode beginNode = findBeginNode(end); |
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68 if (!(beginNode instanceof MergeNode)) { |
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69 visitDeoptBegin(beginNode, deopt, graph); |
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70 } |
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71 } |
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72 } |
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73 if (mergeNode.isDeleted()) { |
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74 if (!deopt.isDeleted()) { |
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75 Debug.log("Merge deleted, deopt moved to %s", findBeginNode(deopt)); |
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76 visitDeoptBegin(findBeginNode(deopt), deopt, graph); |
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77 } |
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78 } |
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79 } else if (deoptBegin.predecessor() instanceof IfNode) { |
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80 IfNode ifNode = (IfNode) deoptBegin.predecessor(); |
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81 BeginNode otherBegin = ifNode.trueSuccessor(); |
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82 LogicNode conditionNode = ifNode.condition(); |
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83 if (conditionNode instanceof InstanceOfNode) { |
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84 // TODO The lowering currently does not support a FixedGuard as the usage of an |
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85 // InstanceOfNode. Relax this restriction. |
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86 return; |
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87 } |
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88 boolean negated = false; |
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89 if (deoptBegin == ifNode.trueSuccessor()) { |
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90 negated = true; |
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91 otherBegin = ifNode.falseSuccessor(); |
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92 } |
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93 BeginNode ifBlockBegin = findBeginNode(ifNode); |
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94 Debug.log("Converting %s on %-5s branch of %s to guard for remaining branch %s. IfBegin=%s", deopt, deoptBegin == ifNode.trueSuccessor() ? "true" : "false", ifNode, otherBegin, |
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95 ifBlockBegin); |
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96 FixedGuardNode guard = graph.add(new FixedGuardNode(conditionNode, deopt.reason(), deopt.action(), negated)); |
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97 otherBegin.replaceAtUsages(ifBlockBegin); |
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98 FixedNode next = otherBegin.next(); |
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99 otherBegin.setNext(null); |
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100 guard.setNext(next); |
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101 ifNode.replaceAtPredecessor(guard); |
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102 GraphUtil.killCFG(ifNode); |
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103 } |
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104 } |
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105 } |