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annotate graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/CullFrameStatesPhase.java @ 7530:5e3d1a68664e

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applied mx eclipseformat to all Java files
author Doug Simon <doug.simon@oracle.com>
date Wed, 23 Jan 2013 16:34:57 +0100
parents b1ebd583be14
children 189864ef6cc2
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1 /*
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2 * Copyright (c) 2012, 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.nodes.*;
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29 import com.oracle.graal.nodes.util.*;
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30 import com.oracle.graal.phases.*;
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31 import com.oracle.graal.phases.graph.*;
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32
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33 /**
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34 * This phase culls unused FrameStates from the graph. It does a post order iteration over the
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35 * graph, and
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36 */
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37 public class CullFrameStatesPhase extends Phase {
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38
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39 private static final DebugMetric metricFrameStatesCulled = Debug.metric("FrameStatesCulled");
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40 private static final DebugMetric metricMergesTraversed = Debug.metric("MergesTraversed");
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41
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42 @Override
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43 protected void run(StructuredGraph graph) {
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44 new CullFrameStates(graph.start(), new State(null)).apply();
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45 }
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46
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47 public static class State implements MergeableState<State> {
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48
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49 private FrameState lastFrameState;
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50
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51 public State(FrameState lastFrameState) {
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52 this.lastFrameState = lastFrameState;
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53 }
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54
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55 @Override
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56 public boolean merge(MergeNode merge, List<State> withStates) {
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57 FrameState stateAfter = merge.stateAfter();
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58 if (merge instanceof LoopBeginNode) {
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59 if (stateAfter != null) {
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60 lastFrameState = stateAfter;
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61 }
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62 return true;
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63 }
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64 metricMergesTraversed.increment();
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65 if (stateAfter != null) {
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66 for (State other : withStates) {
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67 if (other.lastFrameState != lastFrameState) {
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68 lastFrameState = stateAfter;
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69 return true;
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70 }
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71 }
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72 metricFrameStatesCulled.increment();
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73 merge.setStateAfter(null);
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74 if (stateAfter.usages().isEmpty()) {
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75 GraphUtil.killWithUnusedFloatingInputs(stateAfter);
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76 }
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77 }
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78 return true;
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79 }
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80
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81 @Override
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82 public void loopBegin(LoopBeginNode loopBegin) {
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83 }
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84
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85 @Override
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86 public void loopEnds(LoopBeginNode loopBegin, List<State> loopEndStates) {
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87 }
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88
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89 @Override
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90 public void afterSplit(BeginNode node) {
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91 }
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92
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93 @Override
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94 public State clone() {
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95 return new State(lastFrameState);
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96 }
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97 }
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98
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99 public static class CullFrameStates extends PostOrderNodeIterator<State> {
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100
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101 public CullFrameStates(FixedNode start, State initialState) {
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102 super(start, initialState);
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103 }
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104
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105 @Override
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106 protected void node(FixedNode node) {
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107 if (node instanceof StateSplit) {
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108 FrameState stateAfter = ((StateSplit) node).stateAfter();
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109 if (stateAfter != null) {
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110 state.lastFrameState = stateAfter;
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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
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116 }