Mercurial > hg > truffle
annotate graal/GraalCompiler/src/com/sun/c1x/graph/IR.java @ 2705:d669ab61c7c7
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author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 18 May 2011 17:32:14 +0200 |
parents | efbdb3ea95c9 |
children | 4272b7af2d17 |
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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.value.*; |
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32 |
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33 /** |
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34 * This class implements the overall container for the HIR (high-level IR) graph |
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35 * and directs its construction, optimization, and finalization. |
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36 * |
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37 * @author Thomas Wuerthinger |
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38 * @author Ben L. Titzer |
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39 */ |
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40 public class IR { |
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41 |
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42 /** |
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43 * The compilation associated with this IR. |
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44 */ |
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45 public final C1XCompilation compilation; |
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46 |
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47 /** |
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48 * The start block of this IR. |
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49 */ |
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50 public BlockBegin startBlock; |
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51 |
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52 private int maxLocks; |
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53 |
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54 /** |
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55 * The linear-scan ordered list of blocks. |
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56 */ |
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57 private List<BlockBegin> orderedBlocks; |
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58 |
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59 /** |
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60 * Creates a new IR instance for the specified compilation. |
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61 * @param compilation the compilation |
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62 */ |
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63 public IR(C1XCompilation compilation) { |
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64 this.compilation = compilation; |
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65 } |
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66 |
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67 /** |
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68 * Builds the graph, optimizes it, and computes the linear scan block order. |
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69 */ |
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70 public void build() { |
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71 if (C1XOptions.PrintTimers) { |
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72 C1XTimers.HIR_CREATE.start(); |
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73 } |
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74 |
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75 buildGraph(); |
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76 |
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77 if (C1XOptions.PrintTimers) { |
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78 C1XTimers.HIR_CREATE.stop(); |
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79 C1XTimers.HIR_OPTIMIZE.start(); |
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80 } |
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81 |
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82 computeLinearScanOrder(); |
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83 |
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84 if (C1XOptions.PrintTimers) { |
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85 C1XTimers.HIR_OPTIMIZE.stop(); |
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86 } |
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87 } |
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88 |
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89 private void buildGraph() { |
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90 // Graph builder must set the startBlock and the osrEntryBlock |
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91 new GraphBuilder(compilation, this, compilation.graph).build(); |
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92 verifyAndPrint("After graph building"); |
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93 |
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94 if (C1XOptions.PrintCompilation) { |
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95 TTY.print(String.format("%3d blocks | ", this.numberOfBlocks())); |
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96 } |
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97 } |
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98 |
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99 private void computeLinearScanOrder() { |
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100 if (C1XOptions.GenLIR) { |
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101 makeLinearScanOrder(); |
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102 verifyAndPrint("After linear scan order"); |
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103 } |
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104 } |
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105 |
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106 private void makeLinearScanOrder() { |
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107 if (orderedBlocks == null) { |
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108 CriticalEdgeFinder finder = new CriticalEdgeFinder(this); |
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109 startBlock.iteratePreOrder(finder); |
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110 finder.splitCriticalEdges(); |
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111 ComputeLinearScanOrder computeLinearScanOrder = new ComputeLinearScanOrder(compilation.stats.blockCount, startBlock); |
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112 orderedBlocks = computeLinearScanOrder.linearScanOrder(); |
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113 compilation.stats.loopCount = computeLinearScanOrder.numLoops(); |
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114 computeLinearScanOrder.printBlocks(); |
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115 } |
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116 } |
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117 |
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118 /** |
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119 * Gets the linear scan ordering of blocks as a list. |
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120 * @return the blocks in linear scan order |
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121 */ |
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122 public List<BlockBegin> linearScanOrder() { |
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123 return orderedBlocks; |
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124 } |
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125 |
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126 private void print(boolean cfgOnly) { |
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127 if (!TTY.isSuppressed()) { |
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128 TTY.println("IR for " + compilation.method); |
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129 final InstructionPrinter ip = new InstructionPrinter(TTY.out()); |
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130 final BlockPrinter bp = new BlockPrinter(this, ip, cfgOnly); |
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131 startBlock.iteratePreOrder(bp); |
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132 } |
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133 } |
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134 |
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135 /** |
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136 * Verifies the IR and prints it out if the relevant options are set. |
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137 * @param phase the name of the phase for printing |
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138 */ |
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139 public void verifyAndPrint(String phase) { |
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140 if (C1XOptions.PrintHIR && !TTY.isSuppressed()) { |
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141 TTY.println(phase); |
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142 print(false); |
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143 } |
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144 |
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145 if (compilation.compiler.isObserved()) { |
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146 compilation.compiler.fireCompilationEvent(new CompilationEvent(compilation, phase, startBlock, true, false)); |
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147 } |
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148 } |
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149 |
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150 /** |
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151 * Creates and inserts a new block between this block and the specified successor, |
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152 * altering the successor and predecessor lists of involved blocks appropriately. |
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153 * @param source the source of the edge |
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154 * @param target the successor before which to insert a block |
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155 * @return the new block inserted |
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156 */ |
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157 public BlockBegin splitEdge(BlockBegin source, BlockBegin target) { |
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158 int bci; |
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159 if (target.blockPredecessors().size() == 1) { |
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160 bci = target.bci(); |
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161 } else { |
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162 bci = source.end().bci(); |
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163 } |
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164 |
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165 int backEdgeIndex = target.predecessors().indexOf(source.end()); |
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166 |
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167 // create new successor and mark it for special block order treatment |
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168 BlockBegin newSucc = new BlockBegin(bci, nextBlockNumber(), compilation.graph); |
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169 |
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170 // This goto is not a safepoint. |
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171 Goto e = new Goto(target, null, false, compilation.graph); |
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172 newSucc.appendNext(e, bci); |
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173 newSucc.setEnd(e); |
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174 e.reorderSuccessor(0, backEdgeIndex); |
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175 // setup states |
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176 FrameState s = source.end().stateAfter(); |
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177 newSucc.setStateBefore(s); |
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178 e.setStateAfter(s); |
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179 assert newSucc.stateBefore().localsSize() == s.localsSize(); |
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180 assert newSucc.stateBefore().stackSize() == s.stackSize(); |
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181 assert newSucc.stateBefore().locksSize() == s.locksSize(); |
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182 // link predecessor to new block |
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183 source.end().substituteSuccessor(target, newSucc); |
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184 |
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185 // The ordering needs to be the same, so remove the link that the |
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186 // set_end call above added and substitute the new_sux for this |
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187 // block. |
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188 target.removePredecessor(newSucc.end()); |
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189 |
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190 // the successor could be the target of a switch so it might have |
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191 // multiple copies of this predecessor, so substitute the new_sux |
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192 // for the first and delete the rest. |
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193 List<BlockEnd> list = target.blockPredecessors(); |
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194 int x = list.indexOf(source.end()); |
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195 list.set(x, newSucc.end()); |
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196 newSucc.addPredecessor(source.end()); |
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197 Iterator<BlockEnd> iterator = list.iterator(); |
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198 while (iterator.hasNext()) { |
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199 if (iterator.next() == source.end()) { |
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200 iterator.remove(); |
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201 newSucc.addPredecessor(source.end()); |
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202 } |
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203 } |
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204 return newSucc; |
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205 } |
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206 |
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207 public void replaceBlock(BlockBegin oldBlock, BlockBegin newBlock) { |
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208 assert !oldBlock.isExceptionEntry() : "cannot replace exception handler blocks (yet)"; |
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209 for (BlockBegin succ : oldBlock.end().blockSuccessors()) { |
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210 succ.removePredecessor(oldBlock.end()); |
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211 } |
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212 for (BlockEnd pred : oldBlock.blockPredecessors()) { |
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213 // substitute the new successor for this block in each predecessor |
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214 pred.substituteSuccessor(oldBlock, newBlock); |
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215 // and add each predecessor to the successor |
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216 newBlock.addPredecessor(pred); |
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217 } |
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218 // this block is now disconnected; remove all its incoming and outgoing edges |
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219 // oldBlock.blockPredecessors().clear(); |
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220 // oldBlock.end().successors().clear(); |
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221 } |
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222 |
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223 /** |
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224 * Disconnects the specified block from all other blocks. |
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225 * @param block the block to remove from the graph |
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226 */ |
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227 public void disconnectFromGraph(BlockBegin block) { |
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228 for (BlockEnd p : block.blockPredecessors()) { |
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229 p.blockSuccessors().remove(block); |
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230 } |
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231 for (BlockBegin s : block.end().blockSuccessors()) { |
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232 s.blockPredecessors().remove(block); |
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233 } |
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234 } |
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235 |
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236 public int nextBlockNumber() { |
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237 return compilation.stats.blockCount++; |
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238 } |
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239 |
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240 public int numberOfBlocks() { |
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241 return compilation.stats.blockCount; |
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242 } |
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243 |
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244 public int numLoops() { |
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245 return compilation.stats.loopCount; |
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246 } |
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247 |
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248 /** |
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249 * Updates the maximum number of locks held at any one time. |
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250 * |
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251 * @param locks a lock count that will replace the current {@linkplain #maxLocks() max locks} if it is greater |
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252 */ |
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253 public void updateMaxLocks(int locks) { |
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254 if (locks > maxLocks) { |
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255 maxLocks = locks; |
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256 } |
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257 } |
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258 |
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259 /** |
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260 * Gets the number of locks. |
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261 * @return the number of locks |
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262 */ |
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263 public final int maxLocks() { |
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264 return maxLocks; |
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265 } |
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266 } |