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annotate graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/ConvertDeoptimizeToGuardPhase.java @ 15471:ef315dfdda35

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new GraphUtil.predecessorIterable
author Lukas Stadler <lukas.stadler@oracle.com>
date Fri, 02 May 2014 14:47:09 +0200
parents df2ef5204f2b
children df6f2365b153
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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.api.meta.*;
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28 import com.oracle.graal.debug.*;
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29 import com.oracle.graal.graph.*;
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30 import com.oracle.graal.nodes.*;
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31 import com.oracle.graal.nodes.calc.*;
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32 import com.oracle.graal.nodes.util.*;
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33 import com.oracle.graal.phases.*;
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34
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35 /**
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36 * This phase will find branches which always end with a {@link DeoptimizeNode} and replace their
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37 * {@link ControlSplitNode ControlSplitNodes} with {@link FixedGuardNode FixedGuardNodes}.
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38 *
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39 * This is useful because {@link FixedGuardNode FixedGuardNodes} will be lowered to
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40 * {@link GuardNode GuardNodes} which can later be optimized more aggressively than control-flow
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41 * constructs.
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42 *
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43 * This is currently only done for branches that start from a {@link IfNode}. If it encounters a
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44 * branch starting at an other kind of {@link ControlSplitNode}, it will only bring the
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45 * {@link DeoptimizeNode} as close to the {@link ControlSplitNode} as possible.
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46 *
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47 */
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48 public class ConvertDeoptimizeToGuardPhase extends Phase {
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49
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50 private static BeginNode findBeginNode(FixedNode startNode) {
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51 return GraphUtil.predecessorIterable(startNode).filter(BeginNode.class).first();
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52 }
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53
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54 @Override
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55 protected void run(final StructuredGraph graph) {
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56 if (graph.getNodes(DeoptimizeNode.class).isEmpty()) {
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57 return;
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58 }
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59
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60 for (DeoptimizeNode d : graph.getNodes(DeoptimizeNode.class)) {
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61 assert d.isAlive();
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62 visitDeoptBegin(BeginNode.prevBegin(d), d.action(), d.reason(), graph);
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63 }
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64
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65 for (FixedGuardNode fixedGuard : graph.getNodes(FixedGuardNode.class)) {
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66
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67 BeginNode pred = BeginNode.prevBegin(fixedGuard);
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68 if (pred instanceof MergeNode) {
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69 MergeNode merge = (MergeNode) pred;
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70 if (fixedGuard.condition() instanceof CompareNode) {
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71 CompareNode compare = (CompareNode) fixedGuard.condition();
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72 List<AbstractEndNode> mergePredecessors = merge.cfgPredecessors().snapshot();
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73
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74 Constant[] xs = IfNode.constantValues(compare.x(), merge, true);
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75 if (xs == null) {
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76 continue;
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77 }
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78 Constant[] ys = IfNode.constantValues(compare.y(), merge, true);
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79 if (ys == null) {
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80 continue;
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81 }
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82 for (int i = 0; i < mergePredecessors.size(); ++i) {
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83 AbstractEndNode mergePredecessor = mergePredecessors.get(i);
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84 if (!mergePredecessor.isAlive()) {
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85 break;
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86 }
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87 if (xs[i] == null) {
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88 continue;
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89 }
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90 if (ys[i] == null) {
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91 continue;
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92 }
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93 if (xs[i].getKind() != Kind.Object && ys[i].getKind() != Kind.Object &&
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94 compare.condition().foldCondition(xs[i], ys[i], null, compare.unorderedIsTrue()) == fixedGuard.isNegated()) {
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95 visitDeoptBegin(BeginNode.prevBegin(mergePredecessor), fixedGuard.getAction(), fixedGuard.getReason(), graph);
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96 }
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97 }
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98 }
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99 }
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100 }
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101
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102 new DeadCodeEliminationPhase().apply(graph);
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103 }
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104
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105 private void visitDeoptBegin(BeginNode deoptBegin, DeoptimizationAction deoptAction, DeoptimizationReason deoptReason, StructuredGraph graph) {
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106 if (deoptBegin instanceof MergeNode) {
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107 MergeNode mergeNode = (MergeNode) deoptBegin;
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108 Debug.log("Visiting %s", mergeNode);
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109 List<BeginNode> begins = new ArrayList<>();
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110 for (AbstractEndNode end : mergeNode.forwardEnds()) {
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111 BeginNode newBeginNode = findBeginNode(end);
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112 assert !begins.contains(newBeginNode);
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113 begins.add(newBeginNode);
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114 }
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115 for (BeginNode begin : begins) {
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116 assert !begin.isDeleted();
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117 visitDeoptBegin(begin, deoptAction, deoptReason, graph);
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118 }
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119 assert mergeNode.isDeleted();
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parents: 8276
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120 return;
4682
7cb57ac24ab8 Better ConvertDeoptimizeToGuardPhase (experimental).
Andreas Woess <andreas.woess@jku.at>
parents: 4548
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121 } else if (deoptBegin.predecessor() instanceof IfNode) {
7cb57ac24ab8 Better ConvertDeoptimizeToGuardPhase (experimental).
Andreas Woess <andreas.woess@jku.at>
parents: 4548
diff changeset
122 IfNode ifNode = (IfNode) deoptBegin.predecessor();
15145
df2ef5204f2b Remove AbstractBeginNode, move the framestate from AbstractBeginNode to BeginStateSplitNode.
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 14721
diff changeset
123 BeginNode otherBegin = ifNode.trueSuccessor();
7767
4a6646d8eb87 separate BooleanNode and ConstantNode hierarchy, rename BooleanNode to LogicNode and LogicNode to BitLogicNode
Lukas Stadler <lukas.stadler@jku.at>
parents: 7660
diff changeset
124 LogicNode conditionNode = ifNode.condition();
12407
53297646b011 Improve convert deoptimize to guard phase to recognize FixedGuardNode following MergeNode.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 11459
diff changeset
125 FixedGuardNode guard = graph.add(new FixedGuardNode(conditionNode, deoptReason, deoptAction, deoptBegin == ifNode.trueSuccessor()));
9360
412f6e6dad73 Allow FixedGuard usages for InstanceOf nodes.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8441
diff changeset
126 FixedWithNextNode pred = (FixedWithNextNode) ifNode.predecessor();
15145
df2ef5204f2b Remove AbstractBeginNode, move the framestate from AbstractBeginNode to BeginStateSplitNode.
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 14721
diff changeset
127 BeginNode survivingSuccessor;
9360
412f6e6dad73 Allow FixedGuard usages for InstanceOf nodes.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8441
diff changeset
128 if (deoptBegin == ifNode.trueSuccessor()) {
11308
77167d6f868c Fix forward propagation of guarded nodes in ConvertDeoptimizeToGuardPhase.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 9436
diff changeset
129 survivingSuccessor = ifNode.falseSuccessor();
9360
412f6e6dad73 Allow FixedGuard usages for InstanceOf nodes.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8441
diff changeset
130 } else {
11308
77167d6f868c Fix forward propagation of guarded nodes in ConvertDeoptimizeToGuardPhase.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 9436
diff changeset
131 survivingSuccessor = ifNode.trueSuccessor();
77167d6f868c Fix forward propagation of guarded nodes in ConvertDeoptimizeToGuardPhase.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 9436
diff changeset
132 }
77167d6f868c Fix forward propagation of guarded nodes in ConvertDeoptimizeToGuardPhase.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 9436
diff changeset
133 graph.removeSplitPropagate(ifNode, survivingSuccessor);
11333
a07d9113d1f6 Fix in ConvertDeoptimizeToGuardPhase for the case where we need to insert a ProxyNode.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 11308
diff changeset
134 ProxyNode proxyGuard = null;
11308
77167d6f868c Fix forward propagation of guarded nodes in ConvertDeoptimizeToGuardPhase.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 9436
diff changeset
135 for (Node n : survivingSuccessor.usages().snapshot()) {
77167d6f868c Fix forward propagation of guarded nodes in ConvertDeoptimizeToGuardPhase.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 9436
diff changeset
136 if (n instanceof GuardNode || n instanceof ProxyNode) {
77167d6f868c Fix forward propagation of guarded nodes in ConvertDeoptimizeToGuardPhase.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 9436
diff changeset
137 // Keep wired to the begin node.
77167d6f868c Fix forward propagation of guarded nodes in ConvertDeoptimizeToGuardPhase.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 9436
diff changeset
138 } else {
77167d6f868c Fix forward propagation of guarded nodes in ConvertDeoptimizeToGuardPhase.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 9436
diff changeset
139 // Rewire to the fixed guard.
11333
a07d9113d1f6 Fix in ConvertDeoptimizeToGuardPhase for the case where we need to insert a ProxyNode.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 11308
diff changeset
140 if (survivingSuccessor instanceof LoopExitNode) {
a07d9113d1f6 Fix in ConvertDeoptimizeToGuardPhase for the case where we need to insert a ProxyNode.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 11308
diff changeset
141 if (proxyGuard == null) {
11335
ccbbb7dbca69 Make sure the created ProxyNode is of PhiType.Guard.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 11333
diff changeset
142 proxyGuard = ProxyNode.forGuard(guard, survivingSuccessor, graph);
11333
a07d9113d1f6 Fix in ConvertDeoptimizeToGuardPhase for the case where we need to insert a ProxyNode.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 11308
diff changeset
143 }
a07d9113d1f6 Fix in ConvertDeoptimizeToGuardPhase for the case where we need to insert a ProxyNode.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 11308
diff changeset
144 n.replaceFirstInput(survivingSuccessor, proxyGuard);
a07d9113d1f6 Fix in ConvertDeoptimizeToGuardPhase for the case where we need to insert a ProxyNode.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 11308
diff changeset
145 } else {
a07d9113d1f6 Fix in ConvertDeoptimizeToGuardPhase for the case where we need to insert a ProxyNode.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 11308
diff changeset
146 n.replaceFirstInput(survivingSuccessor, guard);
a07d9113d1f6 Fix in ConvertDeoptimizeToGuardPhase for the case where we need to insert a ProxyNode.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 11308
diff changeset
147 }
11308
77167d6f868c Fix forward propagation of guarded nodes in ConvertDeoptimizeToGuardPhase.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 9436
diff changeset
148 }
6548
4dc9e468c8b0 The lowering currently does not support a FixedGuard as the usage of an InstanceOfNode
Christian Wimmer <christian.wimmer@oracle.com>
parents: 6526
diff changeset
149 }
12407
53297646b011 Improve convert deoptimize to guard phase to recognize FixedGuardNode following MergeNode.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 11459
diff changeset
150 Debug.log("Converting deopt on %-5s branch of %s to guard for remaining branch %s.", deoptBegin == ifNode.trueSuccessor() ? "true" : "false", ifNode, otherBegin);
9360
412f6e6dad73 Allow FixedGuard usages for InstanceOf nodes.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8441
diff changeset
151 FixedNode next = pred.next();
412f6e6dad73 Allow FixedGuard usages for InstanceOf nodes.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8441
diff changeset
152 pred.setNext(guard);
412f6e6dad73 Allow FixedGuard usages for InstanceOf nodes.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8441
diff changeset
153 guard.setNext(next);
412f6e6dad73 Allow FixedGuard usages for InstanceOf nodes.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8441
diff changeset
154 return;
8382
496db8bf756d Killing cfg path to deoptimization.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8276
diff changeset
155 }
496db8bf756d Killing cfg path to deoptimization.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8276
diff changeset
156
496db8bf756d Killing cfg path to deoptimization.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8276
diff changeset
157 // 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
158 FixedWithNextNode deoptPred = deoptBegin;
bcfe9832552a Speical case ExceptionObjectNode in deopt to guard conversion.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8387
diff changeset
159 FixedNode next = deoptPred.next();
bcfe9832552a Speical case ExceptionObjectNode in deopt to guard conversion.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8387
diff changeset
160
12407
53297646b011 Improve convert deoptimize to guard phase to recognize FixedGuardNode following MergeNode.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 11459
diff changeset
161 if (!(next instanceof DeoptimizeNode)) {
53297646b011 Improve convert deoptimize to guard phase to recognize FixedGuardNode following MergeNode.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 11459
diff changeset
162 DeoptimizeNode newDeoptNode = graph.add(new DeoptimizeNode(deoptAction, deoptReason));
8388
bcfe9832552a Speical case ExceptionObjectNode in deopt to guard conversion.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8387
diff changeset
163 deoptPred.setNext(newDeoptNode);
bcfe9832552a Speical case ExceptionObjectNode in deopt to guard conversion.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8387
diff changeset
164 assert deoptPred == newDeoptNode.predecessor();
8382
496db8bf756d Killing cfg path to deoptimization.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 8276
diff changeset
165 GraphUtil.killCFG(next);
4682
7cb57ac24ab8 Better ConvertDeoptimizeToGuardPhase (experimental).
Andreas Woess <andreas.woess@jku.at>
parents: 4548
diff changeset
166 }
7cb57ac24ab8 Better ConvertDeoptimizeToGuardPhase (experimental).
Andreas Woess <andreas.woess@jku.at>
parents: 4548
diff changeset
167 }
4548
f55914bc1d67 Added experimental ConvertDeoptimizeToGuardPhase.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
168 }