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annotate graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/ConvertDeoptimizeToGuardPhase.java @ 11413:2c3ca4b71965

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Add more javadoc to ConvertDeoptimizeToGuardPhase
author Gilles Duboscq <duboscq@ssw.jku.at>
date Sun, 25 Aug 2013 15:18:57 +0200
parents a268b0de65d6
children c66cdfb7445b
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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.util.*;
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31 import com.oracle.graal.phases.*;
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32
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33 /**
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34 * This phase will find branches which always end with a {@link DeoptimizeNode} and replace their
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35 * {@link ControlSplitNode ControlSplitNodes} with {@link FixedGuardNode FixedGuardNodes}.
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36 *
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37 * This is useful because {@link FixedGuardNode FixedGuardNodes FixedGuardNodess} will be lowered to
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38 * {@link GuardNode GuardNodes} which can later be optimized more aggressively than control-flow
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39 * constructs.
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40 *
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41 * This is currently only done for branches that start from a {@link IfNode}. If it encounters a
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42 * branch starting at an other kind of {@link ControlSplitNode}, it will only bring the
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43 * {@link DeoptimizeNode} as close to the {@link ControlSplitNode} as possible.
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44 *
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45 */
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46 public class ConvertDeoptimizeToGuardPhase extends Phase {
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47
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48 private static AbstractBeginNode findBeginNode(Node startNode) {
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49 Node n = startNode;
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50 while (true) {
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51 if (n instanceof AbstractBeginNode) {
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52 return (AbstractBeginNode) n;
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53 } else {
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54 n = n.predecessor();
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55 }
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56 }
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57 }
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58
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59 @Override
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60 protected void run(final StructuredGraph graph) {
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61 if (graph.getNodes(DeoptimizeNode.class).isEmpty()) {
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62 return;
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63 }
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64
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65 for (DeoptimizeNode d : graph.getNodes(DeoptimizeNode.class)) {
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66 assert d.isAlive();
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67 visitDeoptBegin(findBeginNode(d), d, graph);
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68 }
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69
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70 new DeadCodeEliminationPhase().apply(graph);
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71 }
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72
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73 private void visitDeoptBegin(AbstractBeginNode deoptBegin, DeoptimizeNode deopt, StructuredGraph graph) {
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74 if (deoptBegin instanceof MergeNode) {
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75 MergeNode mergeNode = (MergeNode) deoptBegin;
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76 Debug.log("Visiting %s followed by %s", mergeNode, deopt);
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77 List<AbstractBeginNode> begins = new ArrayList<>();
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78 for (AbstractEndNode end : mergeNode.forwardEnds()) {
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79 AbstractBeginNode newBeginNode = findBeginNode(end);
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80 assert !begins.contains(newBeginNode);
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81 begins.add(newBeginNode);
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82 }
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83 for (AbstractBeginNode begin : begins) {
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84 assert !begin.isDeleted();
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85 visitDeoptBegin(begin, deopt, graph);
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86 }
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87 assert mergeNode.isDeleted();
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88 return;
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89 } else if (deoptBegin.predecessor() instanceof IfNode) {
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90 IfNode ifNode = (IfNode) deoptBegin.predecessor();
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91 AbstractBeginNode otherBegin = ifNode.trueSuccessor();
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92 LogicNode conditionNode = ifNode.condition();
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93 FixedGuardNode guard = graph.add(new FixedGuardNode(conditionNode, deopt.reason(), deopt.action(), deoptBegin == ifNode.trueSuccessor()));
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94 FixedWithNextNode pred = (FixedWithNextNode) ifNode.predecessor();
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95 AbstractBeginNode survivingSuccessor;
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96 if (deoptBegin == ifNode.trueSuccessor()) {
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97 survivingSuccessor = ifNode.falseSuccessor();
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98 } else {
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99 survivingSuccessor = ifNode.trueSuccessor();
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100 }
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101 graph.removeSplitPropagate(ifNode, survivingSuccessor);
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102 ProxyNode proxyGuard = null;
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103 for (Node n : survivingSuccessor.usages().snapshot()) {
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104 if (n instanceof GuardNode || n instanceof ProxyNode) {
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105 // Keep wired to the begin node.
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106 } else {
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107 // Rewire to the fixed guard.
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108 if (survivingSuccessor instanceof LoopExitNode) {
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109 if (proxyGuard == null) {
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110 proxyGuard = ProxyNode.forGuard(guard, survivingSuccessor, graph);
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111 }
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112 n.replaceFirstInput(survivingSuccessor, proxyGuard);
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113 } else {
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114 n.replaceFirstInput(survivingSuccessor, guard);
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115 }
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116 }
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117 }
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118 Debug.log("Converting %s on %-5s branch of %s to guard for remaining branch %s.", deopt, deoptBegin == ifNode.trueSuccessor() ? "true" : "false", ifNode, otherBegin);
412f6e6dad73 Allow FixedGuard usages for InstanceOf nodes.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8441
diff changeset
119 FixedNode next = pred.next();
412f6e6dad73 Allow FixedGuard usages for InstanceOf nodes.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8441
diff changeset
120 pred.setNext(guard);
412f6e6dad73 Allow FixedGuard usages for InstanceOf nodes.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8441
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121 guard.setNext(next);
412f6e6dad73 Allow FixedGuard usages for InstanceOf nodes.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8441
diff changeset
122 return;
8382
496db8bf756d Killing cfg path to deoptimization.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8276
diff changeset
123 }
496db8bf756d Killing cfg path to deoptimization.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8276
diff changeset
124
496db8bf756d Killing cfg path to deoptimization.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8276
diff changeset
125 // We could not convert the control split - at least cut off control flow after the split.
8388
bcfe9832552a Speical case ExceptionObjectNode in deopt to guard conversion.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8387
diff changeset
126 FixedWithNextNode deoptPred = deoptBegin;
bcfe9832552a Speical case ExceptionObjectNode in deopt to guard conversion.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8387
diff changeset
127 FixedNode next = deoptPred.next();
bcfe9832552a Speical case ExceptionObjectNode in deopt to guard conversion.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8387
diff changeset
128
8382
496db8bf756d Killing cfg path to deoptimization.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8276
diff changeset
129 if (next != deopt) {
8384
0edb2a515cb1 Fixes a corner case when killing the control flowing into a deoptimize node.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8382
diff changeset
130 DeoptimizeNode newDeoptNode = (DeoptimizeNode) deopt.clone(graph);
8388
bcfe9832552a Speical case ExceptionObjectNode in deopt to guard conversion.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8387
diff changeset
131 deoptPred.setNext(newDeoptNode);
bcfe9832552a Speical case ExceptionObjectNode in deopt to guard conversion.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8387
diff changeset
132 assert deoptPred == newDeoptNode.predecessor();
8382
496db8bf756d Killing cfg path to deoptimization.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8276
diff changeset
133 GraphUtil.killCFG(next);
4682
7cb57ac24ab8 Better ConvertDeoptimizeToGuardPhase (experimental).
Andreas Woess <andreas.woess@jku.at>
parents: 4548
diff changeset
134 }
7cb57ac24ab8 Better ConvertDeoptimizeToGuardPhase (experimental).
Andreas Woess <andreas.woess@jku.at>
parents: 4548
diff changeset
135 }
4548
f55914bc1d67 Added experimental ConvertDeoptimizeToGuardPhase.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
136 }