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annotate graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/ConvertDeoptimizeToGuardPhase.java @ 8387:9f0ae7df921e
Bug fix and additional assertions in deoptimize to guard phase.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Tue, 19 Mar 2013 23:08:03 +0100 |
parents | 0edb2a515cb1 |
children | bcfe9832552a |
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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 assert d.isAlive(); |
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55 visitDeoptBegin(findBeginNode(d), d, graph); |
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56 } |
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57 |
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58 new DeadCodeEliminationPhase().apply(graph); |
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59 } |
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60 |
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61 private void visitDeoptBegin(BeginNode deoptBegin, DeoptimizeNode deopt, StructuredGraph graph) { |
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62 if (deoptBegin instanceof MergeNode) { |
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63 MergeNode mergeNode = (MergeNode) deoptBegin; |
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64 Debug.log("Visiting %s followed by %s", mergeNode, deopt); |
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65 List<BeginNode> begins = new ArrayList<>(); |
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66 for (EndNode end : mergeNode.forwardEnds()) { |
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67 BeginNode newBeginNode = findBeginNode(end); |
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68 assert !begins.contains(newBeginNode); |
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69 begins.add(newBeginNode); |
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70 } |
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71 for (BeginNode begin : begins) { |
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72 assert !begin.isDeleted(); |
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73 visitDeoptBegin(begin, deopt, graph); |
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74 } |
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75 assert mergeNode.isDeleted(); |
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76 return; |
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77 } else if (deoptBegin.predecessor() instanceof IfNode) { |
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78 IfNode ifNode = (IfNode) deoptBegin.predecessor(); |
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79 BeginNode otherBegin = ifNode.trueSuccessor(); |
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80 LogicNode conditionNode = ifNode.condition(); |
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81 if (!(conditionNode instanceof InstanceOfNode) && !(conditionNode instanceof InstanceOfDynamicNode)) { |
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82 // TODO The lowering currently does not support a FixedGuard as the usage of an |
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83 // InstanceOfNode. Relax this restriction. |
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84 FixedGuardNode guard = graph.add(new FixedGuardNode(conditionNode, deopt.reason(), deopt.action(), deoptBegin == ifNode.trueSuccessor())); |
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85 FixedWithNextNode pred = (FixedWithNextNode) ifNode.predecessor(); |
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86 if (deoptBegin == ifNode.trueSuccessor()) { |
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87 graph.removeSplitPropagate(ifNode, ifNode.falseSuccessor()); |
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88 } else { |
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89 graph.removeSplitPropagate(ifNode, ifNode.trueSuccessor()); |
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90 } |
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91 Debug.log("Converting %s on %-5s branch of %s to guard for remaining branch %s.", deopt, deoptBegin == ifNode.trueSuccessor() ? "true" : "false", ifNode, otherBegin); |
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92 FixedNode next = pred.next(); |
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93 pred.setNext(guard); |
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94 guard.setNext(next); |
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95 return; |
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96 } |
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97 } |
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98 |
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99 // We could not convert the control split - at least cut off control flow after the split. |
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100 FixedNode next = deoptBegin.next(); |
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101 if (next != deopt) { |
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102 DeoptimizeNode newDeoptNode = (DeoptimizeNode) deopt.clone(graph); |
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103 deoptBegin.setNext(newDeoptNode); |
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104 assert deoptBegin == newDeoptNode.predecessor(); |
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105 GraphUtil.killCFG(next); |
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106 } |
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107 } |
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108 } |