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annotate graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/GuardLoweringPhase.java @ 15108:b6711b514576

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Remove LoopBeginNode loopBegin() from Loop.
author Josef Eisl <josef.eisl@jku.at>
date Wed, 09 Apr 2014 17:38:16 +0200
parents 1bf700e19e84
children df2ef5204f2b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2013, 2013, 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 static com.oracle.graal.phases.GraalOptions.*;
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26
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27 import java.util.*;
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28 import java.util.Map.Entry;
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29
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30 import com.oracle.graal.api.meta.*;
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31 import com.oracle.graal.debug.*;
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32 import com.oracle.graal.graph.*;
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33 import com.oracle.graal.nodes.*;
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34 import com.oracle.graal.nodes.StructuredGraph.GuardsStage;
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35 import com.oracle.graal.nodes.calc.*;
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36 import com.oracle.graal.nodes.cfg.*;
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37 import com.oracle.graal.nodes.extended.*;
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38 import com.oracle.graal.nodes.util.*;
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39 import com.oracle.graal.phases.*;
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40 import com.oracle.graal.phases.graph.*;
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41 import com.oracle.graal.phases.schedule.*;
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42 import com.oracle.graal.phases.schedule.SchedulePhase.SchedulingStrategy;
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43 import com.oracle.graal.phases.tiers.*;
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44
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45 /**
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46 * This phase lowers {@link GuardNode GuardNodes} into corresponding control-flow structure and
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47 * {@link DeoptimizeNode DeoptimizeNodes}.
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48 *
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49 * This allow to enter the {@link GuardsStage#FIXED_DEOPTS FIXED_DEOPTS} stage of the graph where
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50 * all node that may cause deoptimization are fixed.
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51 * <p>
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52 * It first makes a schedule in order to know where the control flow should be placed. Then, for
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53 * each block, it applies two passes. The first one tries to replace null-check guards with implicit
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54 * null checks performed by access to the objects that need to be null checked. The second phase
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55 * does the actual control-flow expansion of the remaining {@link GuardNode GuardNodes}.
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56 */
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57 public class GuardLoweringPhase extends BasePhase<MidTierContext> {
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58
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59 private static final DebugMetric metricImplicitNullCheck = Debug.metric("ImplicitNullCheck");
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60
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61 private static class UseImplicitNullChecks extends ScheduledNodeIterator {
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62
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63 private final IdentityHashMap<ValueNode, GuardNode> nullGuarded = new IdentityHashMap<>();
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64 private final int implicitNullCheckLimit;
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65
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66 UseImplicitNullChecks(int implicitNullCheckLimit) {
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67 this.implicitNullCheckLimit = implicitNullCheckLimit;
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68 }
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69
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70 @Override
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71 protected void processNode(Node node) {
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72 if (node instanceof GuardNode) {
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73 processGuard(node);
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74 } else if (node instanceof Access) {
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75 processAccess((Access) node);
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76 }
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77 if (node instanceof StateSplit && ((StateSplit) node).stateAfter() != null) {
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78 nullGuarded.clear();
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79 } else {
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80 Iterator<Entry<ValueNode, GuardNode>> it = nullGuarded.entrySet().iterator();
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81 while (it.hasNext()) {
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82 Entry<ValueNode, GuardNode> entry = it.next();
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83 GuardNode guard = entry.getValue();
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84 if (guard.usages().contains(node)) {
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85 it.remove();
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86 }
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87 }
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88 }
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89 }
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90
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91 private void processAccess(Access access) {
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92 if (access.canNullCheck()) {
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93 GuardNode guard = nullGuarded.get(access.object());
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94 if (guard != null && isImplicitNullCheck(access.accessLocation())) {
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95 metricImplicitNullCheck.increment();
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96 access.setGuard(null);
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97 FixedAccessNode fixedAccess;
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98 if (access instanceof FloatingAccessNode) {
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99 fixedAccess = ((FloatingAccessNode) access).asFixedNode();
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100 replaceCurrent(fixedAccess);
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101 } else {
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102 fixedAccess = (FixedAccessNode) access;
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103 }
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104 fixedAccess.setNullCheck(true);
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105 LogicNode condition = guard.condition();
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106 guard.replaceAndDelete(fixedAccess);
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107 if (condition.usages().isEmpty()) {
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108 GraphUtil.killWithUnusedFloatingInputs(condition);
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109 }
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110 nullGuarded.remove(fixedAccess.object());
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111 }
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112 }
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113 }
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114
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115 private void processGuard(Node node) {
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116 GuardNode guard = (GuardNode) node;
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117 if (guard.negated() && guard.condition() instanceof IsNullNode && (guard.getSpeculation() == null || guard.getSpeculation().equals(Constant.NULL_OBJECT))) {
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118 ValueNode obj = ((IsNullNode) guard.condition()).object();
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119 nullGuarded.put(obj, guard);
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120 }
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121 }
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122
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123 private boolean isImplicitNullCheck(LocationNode location) {
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124 if (location instanceof ConstantLocationNode) {
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038fa65cbd8d Consistent naming of accessor methods in the LocationNode class hierarchy
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125 return ((ConstantLocationNode) location).getDisplacement() < implicitNullCheckLimit;
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126 } else {
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127 return false;
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128 }
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129 }
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130 }
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131
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132 private static class LowerGuards extends ScheduledNodeIterator {
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133
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134 private final Block block;
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135 private boolean useGuardIdAsDebugId;
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136
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137 public LowerGuards(Block block, boolean useGuardIdAsDebugId) {
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138 this.block = block;
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139 this.useGuardIdAsDebugId = useGuardIdAsDebugId;
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140 }
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141
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142 @Override
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143 protected void processNode(Node node) {
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diff changeset
144 if (node instanceof GuardNode) {
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145 GuardNode guard = (GuardNode) node;
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diff changeset
146 FixedWithNextNode lowered = guard.lowerGuard();
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147 if (lowered != null) {
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diff changeset
148 replaceCurrent(lowered);
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149 } else {
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150 lowerToIf(guard);
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151 }
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152 }
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153 }
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154
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155 private void lowerToIf(GuardNode guard) {
9602
19c5a07c7843 Introduce a graph() method that returns a StructuredGraph, to make many explicit casts unnecessary
Christian Wimmer <christian.wimmer@oracle.com>
parents: 9525
diff changeset
156 StructuredGraph graph = guard.graph();
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ae815a4c112a Rename BeginNode => AbstractBeginNode and make abstract. Introduce concrete subclass BeginNode.
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parents: 9268
diff changeset
157 AbstractBeginNode fastPath = graph.add(new BeginNode());
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38b84d5a66fd Start passing down a 'speculation id' to deoptimizations.
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diff changeset
158 @SuppressWarnings("deprecation")
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diff changeset
159 DeoptimizeNode deopt = graph.add(new DeoptimizeNode(guard.action(), guard.reason(), useGuardIdAsDebugId ? guard.getId() : 0, guard.getSpeculation()));
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parents: 9268
diff changeset
160 AbstractBeginNode deoptBranch = AbstractBeginNode.begin(deopt);
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diff changeset
161 AbstractBeginNode trueSuccessor;
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diff changeset
162 AbstractBeginNode falseSuccessor;
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diff changeset
163 insertLoopExits(deopt);
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diff changeset
164 if (guard.negated()) {
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165 trueSuccessor = deoptBranch;
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diff changeset
166 falseSuccessor = fastPath;
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167 } else {
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diff changeset
168 trueSuccessor = fastPath;
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diff changeset
169 falseSuccessor = deoptBranch;
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170 }
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diff changeset
171 IfNode ifNode = graph.add(new IfNode(guard.condition(), trueSuccessor, falseSuccessor, trueSuccessor == fastPath ? 1 : 0));
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diff changeset
172 guard.replaceAndDelete(fastPath);
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173 insert(ifNode, fastPath);
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174 }
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175
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diff changeset
176 private void insertLoopExits(DeoptimizeNode deopt) {
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Josef Eisl <josef.eisl@jku.at>
parents: 15107
diff changeset
177 Loop<Block> loop = block.getLoop();
9602
19c5a07c7843 Introduce a graph() method that returns a StructuredGraph, to make many explicit casts unnecessary
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parents: 9525
diff changeset
178 StructuredGraph graph = deopt.graph();
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diff changeset
179 while (loop != null) {
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diff changeset
180 LoopExitNode exit = graph.add(new LoopExitNode((LoopBeginNode) loop.header.getBeginNode()));
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diff changeset
181 graph.addBeforeFixed(deopt, exit);
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diff changeset
182 loop = loop.parent;
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183 }
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184 }
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185 }
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186
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diff changeset
187 @Override
9268
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Roland Schatz <roland.schatz@oracle.com>
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diff changeset
188 protected void run(StructuredGraph graph, MidTierContext context) {
13283
17c9afa0bfcb Allow GuardLoweringPhase, FrameStateAssignementPhase and the different lowerings to work with graph at any valid guards stage
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parents: 13154
diff changeset
189 if (graph.getGuardsStage().ordinal() < GuardsStage.FIXED_DEOPTS.ordinal()) {
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diff changeset
190 SchedulePhase schedule = new SchedulePhase(SchedulingStrategy.EARLIEST);
17c9afa0bfcb Allow GuardLoweringPhase, FrameStateAssignementPhase and the different lowerings to work with graph at any valid guards stage
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diff changeset
191 schedule.apply(graph);
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192
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diff changeset
193 for (Block block : schedule.getCFG().getBlocks()) {
13284
a3500d145fe1 make GuardLoweringPhase work even when no context can provide an implicitNullCheckLimit
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parents: 13283
diff changeset
194 processBlock(block, schedule, context != null ? context.getTarget().implicitNullCheckLimit : 0);
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diff changeset
195 }
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parents: 13154
diff changeset
196 graph.setGuardsStage(GuardsStage.FIXED_DEOPTS);
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197 }
11579
ae619d70bf4b Rename LoweringType to GuardsPhase and make it an attribute of StructuredGraphs
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parents: 11396
diff changeset
198
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diff changeset
199 assert graph.getNodes(GuardNode.class).isEmpty();
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diff changeset
200 }
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diff changeset
201
9268
2d80e5f17bf8 Make GuardLoweringPhase reentrant.
Roland Schatz <roland.schatz@oracle.com>
parents: 9203
diff changeset
202 private static void processBlock(Block block, SchedulePhase schedule, int implicitNullCheckLimit) {
9864
063a712fe8d8 converted remaining options in GraalOptions to new system (GRAAL-27)
Doug Simon <doug.simon@oracle.com>
parents: 9646
diff changeset
203 if (OptImplicitNullChecks.getValue() && implicitNullCheckLimit > 0) {
11715
100e196f8728 ScheduledNodeIterator needs to be able to reconnect even if something is inserted after the last fixed node of a block when there is only one successor
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 11705
diff changeset
204 new UseImplicitNullChecks(implicitNullCheckLimit).processNodes(block, schedule);
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diff changeset
205 }
13323
48e821e409eb Add Debug.isDumpEnabledForMethod() and Debug.isLogEnabledForMethod() use it to diable graph compression and enable guard-id-as-debug-id
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 13290
diff changeset
206 new LowerGuards(block, Debug.isDumpEnabledForMethod() || Debug.isLogEnabledForMethod()).processNodes(block, schedule);
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diff changeset
207 }
8207
ed880b9992b4 Add GuardLoweringPhase which transforms floating guards into fixed if+deopt
Gilles Duboscq <duboscq@ssw.jku.at>
parents:
diff changeset
208 }