Mercurial > hg > graal-jvmci-8
annotate graal/GraalCompiler/src/com/sun/c1x/graph/IR.java @ 2530:7e7f817bdb28
Removed dead code elimination2
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 17:05:26 +0200 |
parents | 6edc0306038e |
children | eca17668badf |
rev | line source |
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2507
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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.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.sun.c1x.*; |
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28 import com.sun.c1x.debug.*; |
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29 import com.sun.c1x.ir.*; |
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30 import com.sun.c1x.observer.*; |
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31 import com.sun.c1x.opt.*; |
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32 import com.sun.c1x.value.*; |
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33 |
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34 /** |
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35 * This class implements the overall container for the HIR (high-level IR) graph |
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36 * and directs its construction, optimization, and finalization. |
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37 * |
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38 * @author Thomas Wuerthinger |
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39 * @author Ben L. Titzer |
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40 */ |
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41 public class IR { |
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42 |
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43 /** |
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44 * The compilation associated with this IR. |
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45 */ |
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46 public final C1XCompilation compilation; |
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47 |
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48 /** |
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49 * The start block of this IR. |
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50 */ |
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51 public BlockBegin startBlock; |
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52 |
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53 /** |
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54 * The entry block for an OSR compile. |
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55 */ |
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56 public BlockBegin osrEntryBlock; |
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57 |
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58 /** |
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59 * The top IRScope. |
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60 */ |
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61 public IRScope topScope; |
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62 |
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63 /** |
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64 * The linear-scan ordered list of blocks. |
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65 */ |
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66 private List<BlockBegin> orderedBlocks; |
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67 |
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68 /** |
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69 * Creates a new IR instance for the specified compilation. |
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70 * @param compilation the compilation |
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71 */ |
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72 public IR(C1XCompilation compilation) { |
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73 this.compilation = compilation; |
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74 } |
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75 |
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76 /** |
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77 * Builds the graph, optimizes it, and computes the linear scan block order. |
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78 */ |
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79 public void build() { |
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80 if (C1XOptions.PrintTimers) { |
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81 C1XTimers.HIR_CREATE.start(); |
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82 } |
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83 |
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84 buildGraph(); |
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85 |
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86 if (C1XOptions.PrintTimers) { |
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87 C1XTimers.HIR_CREATE.stop(); |
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88 C1XTimers.HIR_OPTIMIZE.start(); |
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89 } |
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90 |
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91 optimize1(); |
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92 computeLinearScanOrder(); |
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93 |
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94 if (C1XOptions.PrintTimers) { |
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95 C1XTimers.HIR_OPTIMIZE.stop(); |
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96 } |
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97 } |
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98 |
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99 private void buildGraph() { |
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100 topScope = new IRScope(null, null, compilation.method, -1); |
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101 |
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102 // Graph builder must set the startBlock and the osrEntryBlock |
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103 new GraphBuilder(compilation, this).build(topScope); |
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104 assert startBlock != null; |
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105 verifyAndPrint("After graph building"); |
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106 |
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107 if (C1XOptions.PrintCompilation) { |
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108 TTY.print(String.format("%3d blocks | ", this.numberOfBlocks())); |
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109 } |
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110 } |
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111 |
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112 private void optimize1() { |
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113 if (C1XOptions.OptDeadCodeElimination1) { |
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114 new LivenessMarker(this).removeDeadCode(); |
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115 verifyAndPrint("After dead code elimination 1"); |
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116 } |
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117 } |
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118 |
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119 private void computeLinearScanOrder() { |
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120 if (C1XOptions.GenLIR) { |
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121 makeLinearScanOrder(); |
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122 verifyAndPrint("After linear scan order"); |
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123 } |
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124 } |
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125 |
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126 private void makeLinearScanOrder() { |
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127 if (orderedBlocks == null) { |
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128 CriticalEdgeFinder finder = new CriticalEdgeFinder(this); |
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129 startBlock.iteratePreOrder(finder); |
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130 finder.splitCriticalEdges(); |
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131 ComputeLinearScanOrder computeLinearScanOrder = new ComputeLinearScanOrder(compilation.stats.blockCount, startBlock); |
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132 orderedBlocks = computeLinearScanOrder.linearScanOrder(); |
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133 compilation.stats.loopCount = computeLinearScanOrder.numLoops(); |
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134 computeLinearScanOrder.printBlocks(); |
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135 } |
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136 } |
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137 |
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138 /** |
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139 * Gets the linear scan ordering of blocks as a list. |
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140 * @return the blocks in linear scan order |
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141 */ |
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142 public List<BlockBegin> linearScanOrder() { |
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143 return orderedBlocks; |
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144 } |
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145 |
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146 private void print(boolean cfgOnly) { |
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147 if (!TTY.isSuppressed()) { |
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148 TTY.println("IR for " + compilation.method); |
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149 final InstructionPrinter ip = new InstructionPrinter(TTY.out()); |
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150 final BlockPrinter bp = new BlockPrinter(this, ip, cfgOnly, false); |
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151 startBlock.iteratePreOrder(bp); |
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152 } |
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153 } |
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154 |
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155 /** |
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156 * Verifies the IR and prints it out if the relevant options are set. |
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157 * @param phase the name of the phase for printing |
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158 */ |
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159 public void verifyAndPrint(String phase) { |
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160 printToTTY(phase); |
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161 |
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162 if (compilation.compiler.isObserved()) { |
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163 compilation.compiler.fireCompilationEvent(new CompilationEvent(compilation, phase, startBlock, true, false)); |
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164 } |
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165 } |
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166 |
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167 private void printToTTY(String phase) { |
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168 if (C1XOptions.PrintHIR && !TTY.isSuppressed()) { |
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169 TTY.println(phase); |
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170 print(false); |
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171 } |
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172 } |
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173 |
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174 /** |
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175 * Creates and inserts a new block between this block and the specified successor, |
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176 * altering the successor and predecessor lists of involved blocks appropriately. |
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177 * @param source the source of the edge |
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178 * @param target the successor before which to insert a block |
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179 * @return the new block inserted |
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180 */ |
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181 public BlockBegin splitEdge(BlockBegin source, BlockBegin target) { |
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182 int bci; |
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183 if (target.predecessors().size() == 1) { |
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184 bci = target.bci(); |
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185 } else { |
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186 bci = source.end().bci(); |
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187 } |
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188 |
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189 // create new successor and mark it for special block order treatment |
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190 BlockBegin newSucc = new BlockBegin(bci, nextBlockNumber()); |
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191 |
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192 newSucc.setCriticalEdgeSplit(true); |
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193 |
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194 // This goto is not a safepoint. |
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195 Goto e = new Goto(target, null, false); |
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196 newSucc.setNext(e, bci); |
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197 newSucc.setEnd(e); |
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198 // setup states |
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199 FrameState s = source.end().stateAfter(); |
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200 newSucc.setStateBefore(s); |
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201 e.setStateAfter(s); |
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202 assert newSucc.stateBefore().localsSize() == s.localsSize(); |
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203 assert newSucc.stateBefore().stackSize() == s.stackSize(); |
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204 assert newSucc.stateBefore().locksSize() == s.locksSize(); |
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205 // link predecessor to new block |
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206 source.end().substituteSuccessor(target, newSucc); |
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207 |
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208 // The ordering needs to be the same, so remove the link that the |
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209 // set_end call above added and substitute the new_sux for this |
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210 // block. |
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211 target.removePredecessor(newSucc); |
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212 |
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213 // the successor could be the target of a switch so it might have |
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214 // multiple copies of this predecessor, so substitute the new_sux |
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215 // for the first and delete the rest. |
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216 List<BlockBegin> list = target.predecessors(); |
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217 int x = list.indexOf(source); |
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218 assert x >= 0; |
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219 list.set(x, newSucc); |
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220 newSucc.addPredecessor(source); |
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221 Iterator<BlockBegin> iterator = list.iterator(); |
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222 while (iterator.hasNext()) { |
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223 if (iterator.next() == source) { |
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224 iterator.remove(); |
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225 newSucc.addPredecessor(source); |
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226 } |
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227 } |
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228 return newSucc; |
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229 } |
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230 |
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231 public void replaceBlock(BlockBegin oldBlock, BlockBegin newBlock) { |
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232 assert !oldBlock.isExceptionEntry() : "cannot replace exception handler blocks (yet)"; |
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233 for (BlockBegin succ : oldBlock.end().successors()) { |
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234 succ.removePredecessor(oldBlock); |
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235 } |
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236 for (BlockBegin pred : oldBlock.predecessors()) { |
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237 // substitute the new successor for this block in each predecessor |
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238 pred.end().substituteSuccessor(oldBlock, newBlock); |
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239 // and add each predecessor to the successor |
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240 newBlock.addPredecessor(pred); |
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241 } |
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242 // this block is now disconnected; remove all its incoming and outgoing edges |
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243 oldBlock.predecessors().clear(); |
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244 oldBlock.end().successors().clear(); |
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245 } |
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246 |
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247 /** |
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248 * Disconnects the specified block from all other blocks. |
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249 * @param block the block to remove from the graph |
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250 */ |
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251 public void disconnectFromGraph(BlockBegin block) { |
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252 for (BlockBegin p : block.predecessors()) { |
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253 p.end().successors().remove(block); |
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254 } |
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255 for (BlockBegin s : block.end().successors()) { |
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256 s.predecessors().remove(block); |
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257 } |
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258 } |
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259 |
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260 public int nextBlockNumber() { |
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261 return compilation.stats.blockCount++; |
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262 } |
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263 |
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264 public int numberOfBlocks() { |
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265 return compilation.stats.blockCount; |
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266 } |
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267 |
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268 public int numLoops() { |
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269 return compilation.stats.loopCount; |
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270 } |
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271 } |