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annotate graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/FrameStateAssignmentPhase.java @ 19403:61d3cb8e1280

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Add generic parameter to NodeClass. Change Graph#getNodes(Class) to Graph#getNodes(NodeClass).
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Mon, 16 Feb 2015 17:47:43 +0100
parents a2cb19764970
children 93c50cefb9e8
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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 java.util.*;
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26
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27 import com.oracle.graal.compiler.common.*;
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28 import com.oracle.graal.graph.*;
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29 import com.oracle.graal.graph.iterators.*;
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30 import com.oracle.graal.nodes.*;
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31 import com.oracle.graal.nodes.StructuredGraph.GuardsStage;
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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 import com.oracle.graal.phases.graph.*;
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35 import com.oracle.graal.phases.graph.ReentrantNodeIterator.NodeIteratorClosure;
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36
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37 /**
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38 * This phase transfers {@link FrameState} nodes from {@link StateSplit} nodes to
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39 * {@link DeoptimizingNode DeoptimizingNodes}.
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40 *
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41 * This allow to enter the {@link GuardsStage#AFTER_FSA AFTER_FSA} stage of the graph where no new
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42 * node that may cause deoptimization can be introduced anymore.
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43 * <p>
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44 * This Phase processes the graph in post order, assigning the {@link FrameState} from the last
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45 * {@link StateSplit} node to {@link DeoptimizingNode DeoptimizingNodes}.
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46 */
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47 public class FrameStateAssignmentPhase extends Phase {
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48
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49 private static class FrameStateAssignmentClosure extends NodeIteratorClosure<FrameState> {
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50
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51 @Override
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52 protected FrameState processNode(FixedNode node, FrameState previousState) {
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53 FrameState currentState = previousState;
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54 if (node instanceof DeoptimizingNode.DeoptBefore) {
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55 DeoptimizingNode.DeoptBefore deopt = (DeoptimizingNode.DeoptBefore) node;
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56 if (deopt.canDeoptimize() && deopt.stateBefore() == null) {
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57 GraalInternalError.guarantee(currentState != null, "no FrameState at DeoptimizingNode %s", deopt);
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58 deopt.setStateBefore(currentState);
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59 }
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60 }
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61
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62 if (node instanceof StateSplit) {
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63 StateSplit stateSplit = (StateSplit) node;
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64 FrameState stateAfter = stateSplit.stateAfter();
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65 if (stateAfter != null) {
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66 currentState = stateAfter;
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67 stateSplit.setStateAfter(null);
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68 }
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69 }
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71 if (node instanceof DeoptimizingNode.DeoptDuring) {
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72 DeoptimizingNode.DeoptDuring deopt = (DeoptimizingNode.DeoptDuring) node;
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73 if (deopt.canDeoptimize()) {
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74 GraalInternalError.guarantee(currentState != null, "no FrameState at DeoptimizingNode %s", deopt);
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75 deopt.computeStateDuring(currentState);
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76 }
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77 }
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78
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79 if (node instanceof DeoptimizingNode.DeoptAfter) {
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80 DeoptimizingNode.DeoptAfter deopt = (DeoptimizingNode.DeoptAfter) node;
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81 if (deopt.canDeoptimize() && deopt.stateAfter() == null) {
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82 GraalInternalError.guarantee(currentState != null, "no FrameState at DeoptimizingNode %s", deopt);
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83 deopt.setStateAfter(currentState);
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84 }
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85 }
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86
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87 return currentState;
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88 }
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89
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90 @Override
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91 protected FrameState merge(AbstractMergeNode merge, List<FrameState> states) {
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92 FrameState singleFrameState = singleFrameState(states);
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93 return singleFrameState == null ? merge.stateAfter() : singleFrameState;
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94 }
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95
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96 @Override
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97 protected FrameState afterSplit(AbstractBeginNode node, FrameState oldState) {
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98 return oldState;
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99 }
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100
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101 @Override
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102 protected Map<LoopExitNode, FrameState> processLoop(LoopBeginNode loop, FrameState initialState) {
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103 return ReentrantNodeIterator.processLoop(this, loop, initialState).exitStates;
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104 }
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105 }
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106
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107 @Override
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108 protected void run(StructuredGraph graph) {
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109 assert !graph.getGuardsStage().allowsFloatingGuards() && checkFixedDeopts(graph);
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110 if (graph.getGuardsStage().areFrameStatesAtSideEffects()) {
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111 ReentrantNodeIterator.apply(new FrameStateAssignmentClosure(), graph.start(), null);
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112 graph.setGuardsStage(GuardsStage.AFTER_FSA);
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113 graph.getNodes(FrameState.TYPE).filter(state -> state.hasNoUsages()).forEach(GraphUtil::killWithUnusedFloatingInputs);
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114 }
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115 }
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116
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117 private static boolean checkFixedDeopts(StructuredGraph graph) {
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118 NodePredicate isFloatingNode = GraphUtil.isFloatingNode();
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119 for (Node n : graph.getNodes().filterInterface(DeoptimizingNode.class)) {
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120 if (((DeoptimizingNode) n).canDeoptimize() && isFloatingNode.apply(n)) {
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121 return false;
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122 }
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123 }
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124 return true;
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125 }
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126
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127 private static FrameState singleFrameState(List<FrameState> states) {
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128 FrameState singleState = states.get(0);
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129 for (int i = 1; i < states.size(); ++i) {
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130 if (states.get(i) != singleState) {
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131 return null;
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132 }
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133 }
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134 return singleState;
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parents: 8983
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135 }
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136 }