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annotate graal/Compiler/src/com/sun/c1x/opt/BlockMerger.java @ 2507:9ec15d6914ca

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Pull over of compiler from maxine repository.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:43:22 +0200
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2507
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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.opt;
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24
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25 import com.sun.c1x.*;
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26 import com.sun.c1x.graph.*;
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27 import com.sun.c1x.ir.*;
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28 import com.sun.c1x.value.*;
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29 import com.sun.c1x.value.FrameState.*;
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30
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31 /**
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32 * This class implements block merging, which combines adjacent basic blocks into a larger
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33 * basic block, and block skipping, which removes empty blocks that end in a Goto with
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34 * their target.
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35 *
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36 * @author Ben L. Titzer
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37 */
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38 public class BlockMerger implements BlockClosure {
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39
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40 private final BlockBegin startBlock;
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41 private final IR ir;
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42
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43 public BlockMerger(IR ir) {
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44 this.ir = ir;
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45 startBlock = ir.startBlock;
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46 startBlock.iteratePreOrder(this);
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47 }
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48
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49 public void apply(BlockBegin block) {
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50 while (block.end() instanceof Goto && block != startBlock) {
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51 BlockEnd end = block.end();
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52 BlockBegin sux = end.defaultSuccessor();
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53
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54 assert end.successors().size() == 1 : "end must have exactly one successor";
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55 assert !sux.isExceptionEntry() : "should not have Goto to exception entry";
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56
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57 if (!end.isSafepoint()) {
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58 if (sux.numberOfPreds() == 1) {
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59 // the successor has only one predecessor, merge it into this block
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60 mergeBlocks(block, sux, end);
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61 C1XMetrics.BlocksMerged++;
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62 continue;
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63 } else if (C1XOptions.OptBlockSkipping && block.next() == end && !block.isExceptionEntry()) {
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64 // the successor has multiple predecessors, but this block is empty
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65 skipBlock(block, sux, end);
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66 break;
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67 }
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68 }
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69 break;
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70 }
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71 }
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72
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73 private void skipBlock(BlockBegin block, final BlockBegin sux, BlockEnd oldEnd) {
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74 final FrameState oldState = oldEnd.stateAfter();
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75 assert sux.stateBefore().scope() == oldState.scope();
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76 boolean hasAtLeastOnePhi = block.stateBefore().forEachPhi(block, new PhiProcedure() {
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77 public boolean doPhi(Phi phi) {
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78 return false;
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79 }
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80 });
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81
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82 if (hasAtLeastOnePhi) {
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83 // can't skip a block that has phis
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84 return;
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85 }
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86 for (final BlockBegin pred : block.predecessors()) {
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87 final FrameState predState = pred.end().stateAfter();
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88 if (predState.scope() != oldState.scope() || predState.stackSize() != oldState.stackSize()) {
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89 // scopes would not match after skipping this block
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90 // XXX: if phi's were smarter about scopes, this would not be necessary
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91 return;
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92 }
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93 boolean atLeastOneSuxPhiMergesFromAnotherBlock = !sux.stateBefore().forEachPhi(sux, new PhiProcedure() {
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94 public boolean doPhi(Phi phi) {
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95 if (phi.inputIn(sux.stateBefore()) != phi.inputIn(pred.end().stateAfter())) {
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96 return false;
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97 }
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98 return true;
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99 }
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100 });
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101
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102 if (atLeastOneSuxPhiMergesFromAnotherBlock) {
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103 return;
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104 }
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105 }
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106 ir.replaceBlock(block, sux);
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107 C1XMetrics.BlocksSkipped++;
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108 }
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109
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110 private void mergeBlocks(BlockBegin block, BlockBegin sux, BlockEnd oldEnd) {
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111 BlockEnd newEnd;
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112 // find instruction before oldEnd & append first instruction of sux block
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113 Instruction prev = oldEnd.prev(block);
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114 Instruction next = sux.next();
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115 assert !(prev instanceof BlockEnd) : "must not be a BlockEnd";
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116 prev.setNext(next, next.bci());
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117 BlockUtil.disconnectFromGraph(sux);
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118 newEnd = sux.end();
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119 block.setEnd(newEnd);
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120 // add exception handlers of deleted block, if any
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121 for (BlockBegin xhandler : sux.exceptionHandlerBlocks()) {
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122 block.addExceptionHandler(xhandler);
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123
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124 // also substitute predecessor of exception handler
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125 assert xhandler.isPredecessor(sux) : "missing predecessor";
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126 xhandler.removePredecessor(sux);
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127 if (!xhandler.isPredecessor(block)) {
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128 xhandler.addPredecessor(block);
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129 }
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130 }
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131 }
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132 }