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annotate graal/GraalCompiler/src/com/sun/c1x/graph/CriticalEdgeFinder.java @ 2804:095162a84dcc

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Introduced scheduling code.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Fri, 27 May 2011 18:44:13 +0200
parents 2af109bec0c0
children c3f64b66fc78
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1 /*
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2 * Copyright (c) 2009, 2010, 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.sun.c1x.graph;
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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.graph.*;
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28 import com.sun.c1x.*;
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29 import com.sun.c1x.debug.*;
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30 import com.sun.c1x.ir.*;
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31 import com.sun.c1x.lir.*;
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32
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33 /**
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34 * This class finds and splits "critical" edges in the control flow graph.
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35 * An edge between two blocks {@code A} and {@code B} is "critical" if {@code A}
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36 * has more than one successor and {@code B} has more than one predecessor. Such
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37 * edges are split by adding a block between the two blocks.
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38 */
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39 public class CriticalEdgeFinder {
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40
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41 private final List<LIRBlock> lirBlocks;
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42 private final Graph graph;
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43
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44 /**
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45 * The graph edges represented as a map from source to target nodes.
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46 * Using a linked hash map makes compilation tracing more deterministic and thus eases debugging.
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47 */
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48 private Map<LIRBlock, List<LIRBlock>> edges = C1XOptions.DetailedAsserts ?
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49 new LinkedHashMap<LIRBlock, List<LIRBlock>>() :
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50 new HashMap<LIRBlock, List<LIRBlock>>();
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51
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52 public CriticalEdgeFinder(List<LIRBlock> lirBlocks, Graph graph) {
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53 this.lirBlocks = lirBlocks;
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54 this.graph = graph;
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55 for (LIRBlock block : lirBlocks) {
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56 apply(block);
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57 }
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58
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59 }
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60
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61 private void apply(LIRBlock block) {
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62 if (block.numberOfSux() >= 2) {
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63 for (LIRBlock succ : block.blockSuccessors()) {
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64 if (succ.numberOfPreds() >= 2) {
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65 // TODO: (tw) probably we don't have to make it a critical edge if succ only contains the _same_ predecessor multiple times.
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66 recordCriticalEdge(block, succ);
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67 }
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68 }
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69 }
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70 }
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71
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72 private void recordCriticalEdge(LIRBlock block, LIRBlock succ) {
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73 if (!edges.containsKey(block)) {
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74 edges.put(block, new ArrayList<LIRBlock>());
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75 }
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76
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77 edges.get(block).add(succ);
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78 }
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79
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80 public void splitCriticalEdges() {
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81 for (Map.Entry<LIRBlock, List<LIRBlock>> entry : edges.entrySet()) {
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82 LIRBlock from = entry.getKey();
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83 for (LIRBlock to : entry.getValue()) {
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84 LIRBlock split = splitEdge(from, to);
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85 if (C1XOptions.PrintHIR) {
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86 TTY.println("Split edge between block %d and block %d, creating new block %d", from.blockID(), to.blockID(), split.blockID());
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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
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92
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93 /**
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94 * Creates and inserts a new block between this block and the specified successor,
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95 * altering the successor and predecessor lists of involved blocks appropriately.
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96 * @param source the source of the edge
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97 * @param target the successor before which to insert a block
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98 * @return the new block inserted
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99 */
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100 public LIRBlock splitEdge(LIRBlock source, LIRBlock target) {
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101
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102 // create new successor and mark it for special block order treatment
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103 LIRBlock newSucc = new LIRBlock(lirBlocks.size());
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104 lirBlocks.add(newSucc);
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105
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106 // This goto is not a safepoint.
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107 Anchor e = new Anchor(null, graph);
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108 Node sourceInstruction = source.getInstructions().get(source.getInstructions().size() - 1);
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109 Node targetInstruction = target.getInstructions().get(0);
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110 int sourceInstructionPredIndex = targetInstruction.predecessors().indexOf(sourceInstruction);
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111 assert sourceInstructionPredIndex != -1 : "must find source instruction " + sourceInstruction + " in predecessor array of target instruction " + targetInstruction;
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112 int replacedIndex = targetInstruction.predecessorsIndex().get(sourceInstructionPredIndex);
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113 assert replacedIndex != -1 && sourceInstruction.successors().get(replacedIndex) != null;
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114 e.successors().setAndClear(1, sourceInstruction, replacedIndex);
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115 sourceInstruction.successors().set(replacedIndex, e);
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116 newSucc.getInstructions().add(e);
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117 assert e.defaultSuccessor() != null;
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118 source.substituteSuccessor(target, newSucc);
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119 target.substitutePredecessor(source, newSucc);
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120 newSucc.blockPredecessors().add(source);
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121 newSucc.blockSuccessors().add(target);
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122 return newSucc;
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123 }
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124 }