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annotate graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/DeadCodeEliminationPhase.java @ 13277:ce017d1e4234

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Merge.
author Christian Humer <christian.humer@gmail.com>
date Mon, 09 Dec 2013 17:31:12 +0100
parents 2c4aa758ee18
children c258331fdde6
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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 com.oracle.graal.debug.*;
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26 import com.oracle.graal.graph.*;
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27 import com.oracle.graal.nodes.*;
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28 import com.oracle.graal.phases.*;
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29
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30 public class DeadCodeEliminationPhase extends Phase {
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31
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32 // Metrics
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33 private static final DebugMetric metricNodesRemoved = Debug.metric("NodesRemoved");
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34
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35 @Override
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36 protected void run(StructuredGraph graph) {
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37 NodeFlood flood = graph.createNodeFlood();
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38
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39 flood.add(graph.start());
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40 iterateSuccessors(flood);
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41 disconnectCFGNodes(flood, graph);
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42 iterateInputs(flood, graph);
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43 deleteNodes(flood, graph);
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44
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45 // remove chained Merges
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46 for (MergeNode merge : graph.getNodes(MergeNode.class)) {
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47 if (merge.forwardEndCount() == 1 && !(merge instanceof LoopBeginNode)) {
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48 graph.reduceTrivialMerge(merge);
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49 }
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50 }
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51 }
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52
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53 private static void iterateSuccessors(NodeFlood flood) {
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54 for (Node current : flood) {
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55 if (current instanceof AbstractEndNode) {
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56 AbstractEndNode end = (AbstractEndNode) current;
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57 flood.add(end.merge());
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58 } else {
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59 for (Node successor : current.successors()) {
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60 flood.add(successor);
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61 }
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62 }
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63 }
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64 }
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65
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66 private static void disconnectCFGNodes(NodeFlood flood, StructuredGraph graph) {
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67 for (AbstractEndNode node : graph.getNodes(AbstractEndNode.class)) {
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68 if (!flood.isMarked(node)) {
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69 MergeNode merge = node.merge();
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70 if (merge != null && flood.isMarked(merge)) {
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71 // We are a dead end node leading to a live merge.
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72 merge.removeEnd(node);
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73 }
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74 }
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75 }
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76 for (LoopBeginNode loop : graph.getNodes(LoopBeginNode.class)) {
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77 if (flood.isMarked(loop)) {
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78 boolean reachable = false;
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79 for (LoopEndNode end : loop.loopEnds()) {
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80 if (flood.isMarked(end)) {
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81 reachable = true;
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82 break;
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83 }
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84 }
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85 if (!reachable) {
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86 Debug.log("Removing loop with unreachable end: %s", loop);
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87 for (LoopEndNode end : loop.loopEnds().snapshot()) {
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88 loop.removeEnd(end);
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89 }
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90 graph.reduceDegenerateLoopBegin(loop);
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91 }
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92 }
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93 }
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94 }
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95
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96 private static void deleteNodes(NodeFlood flood, StructuredGraph graph) {
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97 for (Node node : graph.getNodes()) {
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98 if (!flood.isMarked(node)) {
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99 node.clearInputs();
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100 node.clearSuccessors();
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101 }
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102 }
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103 for (Node node : graph.getNodes()) {
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104 if (!flood.isMarked(node)) {
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105 metricNodesRemoved.increment();
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106 node.safeDelete();
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107 }
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108 }
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109 }
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110
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111 private static void iterateInputs(NodeFlood flood, StructuredGraph graph) {
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112 for (Node node : graph.getNodes()) {
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113 if (flood.isMarked(node)) {
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114 for (Node input : node.inputs()) {
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115 if (!input.isExternal()) {
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116 flood.add(input);
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117 }
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118 }
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119 }
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120 }
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121 for (Node current : flood) {
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122 for (Node input : current.inputs()) {
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123 if (!input.isExternal()) {
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124 flood.add(input);
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125 }
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126 }
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127 }
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128 }
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129
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130 }