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annotate graal/com.oracle.graal.lir/src/com/oracle/graal/lir/ControlFlowOptimizer.java @ 14806:a8723f1ff542
LIR renamed setter and getter functions.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Mon, 17 Mar 2014 19:18:35 +0100 |
parents | 6ce74db1c9fb |
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1 /* |
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2 * Copyright (c) 2009, 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.lir; |
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24 |
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25 import static com.oracle.graal.lir.LIR.*; |
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26 |
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27 import java.util.*; |
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28 |
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29 import com.oracle.graal.debug.*; |
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30 import com.oracle.graal.nodes.cfg.*; |
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31 |
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32 /** |
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33 * This class performs basic optimizations on the control flow graph after LIR generation. |
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34 */ |
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35 public final class ControlFlowOptimizer { |
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36 |
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37 /** |
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38 * Performs control flow optimizations on the given LIR graph. |
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39 */ |
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40 public static <T extends AbstractBlock<T>> void optimize(LIR lir, List<T> codeEmittingOrder) { |
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41 ControlFlowOptimizer.deleteEmptyBlocks(lir, codeEmittingOrder); |
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42 } |
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43 |
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44 private ControlFlowOptimizer() { |
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45 } |
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46 |
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47 private static final DebugMetric BLOCKS_DELETED = Debug.metric("BlocksDeleted"); |
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48 |
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49 /** |
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50 * Checks whether a block can be deleted. Only blocks with exactly one successor and an |
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51 * unconditional branch to this successor are eligable. |
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52 * |
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53 * @param block the block checked for deletion |
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54 * @return whether the block can be deleted |
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55 */ |
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56 private static boolean canDeleteBlock(LIR lir, AbstractBlock<?> block) { |
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57 if (block.getSuccessorCount() != 1 || block.getPredecessorCount() == 0 || block.getSuccessors().iterator().next() == block) { |
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58 return false; |
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59 } |
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60 |
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61 List<LIRInstruction> instructions = lir.getLIRforBlock(block); |
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62 |
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63 assert instructions.size() >= 2 : "block must have label and branch"; |
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64 assert instructions.get(0) instanceof StandardOp.LabelOp : "first instruction must always be a label"; |
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65 assert instructions.get(instructions.size() - 1) instanceof StandardOp.JumpOp : "last instruction must always be a branch"; |
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66 assert ((StandardOp.JumpOp) instructions.get(instructions.size() - 1)).destination().label() == ((StandardOp.LabelOp) lir.getLIRforBlock(block.getSuccessors().iterator().next()).get(0)).getLabel() : "branch target must be the successor"; |
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67 |
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68 // Block must have exactly one successor. |
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69 return instructions.size() == 2 && !instructions.get(instructions.size() - 1).hasState() && !block.isExceptionEntry(); |
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70 } |
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71 |
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72 private static void alignBlock(LIR lir, AbstractBlock<?> block) { |
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73 if (!block.isAligned()) { |
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74 block.setAlign(true); |
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75 List<LIRInstruction> instructions = lir.getLIRforBlock(block); |
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76 assert instructions.get(0) instanceof StandardOp.LabelOp : "first instruction must always be a label"; |
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77 StandardOp.LabelOp label = (StandardOp.LabelOp) instructions.get(0); |
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78 instructions.set(0, new StandardOp.LabelOp(label.getLabel(), true)); |
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79 } |
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80 } |
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81 |
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82 private static <T extends AbstractBlock<T>> void deleteEmptyBlocks(LIR lir, List<T> blocks) { |
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83 assert verifyBlocks(lir, blocks); |
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84 Iterator<T> iterator = blocks.iterator(); |
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85 while (iterator.hasNext()) { |
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86 T block = iterator.next(); |
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87 if (canDeleteBlock(lir, block)) { |
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88 // adjust successor and predecessor lists |
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89 T other = block.getSuccessors().iterator().next(); |
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90 for (AbstractBlock<T> pred : block.getPredecessors()) { |
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91 Collections.replaceAll(pred.getSuccessors(), block, other); |
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92 } |
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93 for (int i = 0; i < other.getPredecessorCount(); i++) { |
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94 if (other.getPredecessors().get(i) == block) { |
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95 other.getPredecessors().remove(i); |
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96 other.getPredecessors().addAll(i, block.getPredecessors()); |
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97 } |
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98 } |
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99 block.getSuccessors().clear(); |
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100 block.getPredecessors().clear(); |
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101 |
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102 if (block.isAligned()) { |
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103 alignBlock(lir, other); |
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104 } |
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105 |
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106 BLOCKS_DELETED.increment(); |
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107 iterator.remove(); |
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108 } |
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109 } |
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110 assert verifyBlocks(lir, blocks); |
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111 } |
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Clean up ControlFlowOptimizer.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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