Mercurial > hg > graal-jvmci-8
annotate graal/GraalCompiler/src/com/sun/c1x/graph/IR.java @ 2781:bda5972a40a5
remove unnecessary BlockBegin nodes in frontend
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Tue, 24 May 2011 15:31:52 +0200 |
parents | 398b8fa5dc81 |
children | 915456e4959e |
rev | line source |
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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.oracle.graal.graph.*; |
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28 import com.oracle.max.graal.schedule.*; |
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29 import com.sun.c1x.*; |
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30 import com.sun.c1x.debug.*; |
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31 import com.sun.c1x.ir.*; |
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32 import com.sun.c1x.lir.*; |
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33 import com.sun.c1x.observer.*; |
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34 |
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35 /** |
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36 * This class implements the overall container for the HIR (high-level IR) graph |
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37 * and directs its construction, optimization, and finalization. |
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38 */ |
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39 public class IR { |
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40 |
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41 /** |
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42 * The compilation associated with this IR. |
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43 */ |
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44 public final C1XCompilation compilation; |
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45 |
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46 /** |
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47 * The start block of this IR. |
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48 */ |
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49 public LIRBlock startBlock; |
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50 |
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51 private int maxLocks; |
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52 |
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53 /** |
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54 * The linear-scan ordered list of blocks. |
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55 */ |
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56 private List<LIRBlock> orderedBlocks; |
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57 |
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58 /** |
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59 * Creates a new IR instance for the specified compilation. |
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60 * @param compilation the compilation |
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61 */ |
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62 public IR(C1XCompilation compilation) { |
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63 this.compilation = compilation; |
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64 } |
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65 |
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66 public Map<Value, LIRBlock> valueToBlock; |
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67 |
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68 /** |
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69 * Builds the graph, optimizes it, and computes the linear scan block order. |
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70 */ |
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71 public void build() { |
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72 if (C1XOptions.PrintTimers) { |
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73 C1XTimers.HIR_CREATE.start(); |
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74 } |
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75 |
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76 buildGraph(); |
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77 |
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78 if (C1XOptions.PrintTimers) { |
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79 C1XTimers.HIR_CREATE.stop(); |
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80 C1XTimers.HIR_OPTIMIZE.start(); |
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81 } |
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82 |
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83 Schedule schedule = new Schedule(this.compilation.graph); |
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84 List<Block> blocks = schedule.getBlocks(); |
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85 NodeMap<Block> nodeToBlock = schedule.getNodeToBlock(); |
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86 Map<Block, LIRBlock> map = new HashMap<Block, LIRBlock>(); |
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87 for (Block b : blocks) { |
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88 map.put(b, new LIRBlock(b.blockID())); |
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89 } |
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90 |
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91 for (Block b : blocks) { |
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92 for (Block succ : b.getSuccessors()) { |
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93 map.get(b).blockSuccessors().add(map.get(succ)); |
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94 } |
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95 |
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96 for (Block pred : b.getPredecessors()) { |
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97 map.get(b).blockPredecessors().add(map.get(pred)); |
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98 } |
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99 } |
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100 |
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101 // TODO(tw): Schedule nodes within a block. |
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102 |
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103 |
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104 valueToBlock = computeLinearScanOrder(); |
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105 verifyAndPrint("After linear scan order"); |
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106 |
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107 if (C1XOptions.PrintTimers) { |
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108 C1XTimers.HIR_OPTIMIZE.stop(); |
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109 } |
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110 } |
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111 |
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112 private void buildGraph() { |
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113 // Graph builder must set the startBlock and the osrEntryBlock |
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114 new GraphBuilder(compilation, this, compilation.graph).build(); |
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115 verifyAndPrint("After graph building"); |
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116 |
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117 if (C1XOptions.PrintCompilation) { |
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118 TTY.print(String.format("%3d blocks | ", this.numberOfBlocks())); |
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119 } |
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120 } |
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121 |
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122 private Map<Value, LIRBlock> computeLinearScanOrder() { |
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123 return makeLinearScanOrder(); |
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124 } |
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125 |
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126 private Map<Value, LIRBlock> makeLinearScanOrder() { |
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127 |
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128 Map<Value, LIRBlock> valueToBlock = new HashMap<Value, LIRBlock>(); |
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129 |
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130 if (orderedBlocks == null) { |
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131 CriticalEdgeFinder finder = new CriticalEdgeFinder(this); |
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132 ((BlockBegin) getHIRStartBlock()).iteratePreOrder(finder); |
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133 finder.splitCriticalEdges(); |
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134 ComputeLinearScanOrder computeLinearScanOrder = new ComputeLinearScanOrder(compilation.stats.blockCount, (BlockBegin) getHIRStartBlock()); |
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135 List<BlockBegin> blocks = computeLinearScanOrder.linearScanOrder(); |
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136 orderedBlocks = new ArrayList<LIRBlock>(); |
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137 |
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138 int z = 0; |
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139 for (BlockBegin bb : blocks) { |
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140 LIRBlock lirBlock = new LIRBlock(z); |
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141 lirBlock.getInstructions().add(bb); |
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142 valueToBlock.put(bb, lirBlock); |
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143 lirBlock.setLinearScanNumber(bb.linearScanNumber()); |
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144 // TODO(tw): Initialize LIRBlock.linearScanLoopHeader and LIRBlock.linearScanLoopEnd |
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145 lirBlock.setStateBefore(bb.stateBefore()); |
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146 orderedBlocks.add(lirBlock); |
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147 ++z; |
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148 } |
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149 |
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150 z = 0; |
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151 for (BlockBegin bb : blocks) { |
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152 LIRBlock lirBlock = orderedBlocks.get(z); |
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153 for (int i = 0; i < bb.numberOfPreds(); ++i) { |
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154 lirBlock.blockPredecessors().add(valueToBlock.get(bb.predAt(i).block())); |
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155 } |
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156 |
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157 BlockEnd end = bb.end(); |
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158 for (int i = 0; i < end.blockSuccessorCount(); ++i) { |
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159 lirBlock.blockSuccessors().add(valueToBlock.get(end.blockSuccessor(i))); |
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160 } |
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161 |
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162 Instruction first = bb; |
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163 while (first != null) { |
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164 lirBlock.getInstructions().add(first); |
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165 first = first.next(); |
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166 } |
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167 ++z; |
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168 } |
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169 |
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170 startBlock = valueToBlock.get(getHIRStartBlock()); |
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171 assert startBlock != null; |
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172 compilation.stats.loopCount = computeLinearScanOrder.numLoops(); |
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173 } |
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174 return valueToBlock; |
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175 } |
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176 |
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177 /** |
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178 * Gets the linear scan ordering of blocks as a list. |
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179 * @return the blocks in linear scan order |
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180 */ |
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181 public List<LIRBlock> linearScanOrder() { |
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182 return orderedBlocks; |
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183 } |
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184 |
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185 private void print(boolean cfgOnly) { |
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186 if (!TTY.isSuppressed()) { |
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187 TTY.println("IR for " + compilation.method); |
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188 final InstructionPrinter ip = new InstructionPrinter(TTY.out()); |
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189 final BlockPrinter bp = new BlockPrinter(this, ip, cfgOnly); |
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190 ((BlockBegin) getHIRStartBlock()).iteratePreOrder(bp); |
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191 } |
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192 } |
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193 |
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194 /** |
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195 * Verifies the IR and prints it out if the relevant options are set. |
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196 * @param phase the name of the phase for printing |
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197 */ |
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198 public void verifyAndPrint(String phase) { |
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199 if (C1XOptions.PrintHIR && !TTY.isSuppressed()) { |
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200 TTY.println(phase); |
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201 print(false); |
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202 } |
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203 |
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204 if (compilation.compiler.isObserved()) { |
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205 compilation.compiler.fireCompilationEvent(new CompilationEvent(compilation, phase, getHIRStartBlock(), true, false)); |
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206 } |
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207 } |
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208 |
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209 /** |
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210 * Creates and inserts a new block between this block and the specified successor, |
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211 * altering the successor and predecessor lists of involved blocks appropriately. |
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212 * @param source the source of the edge |
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213 * @param target the successor before which to insert a block |
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214 * @return the new block inserted |
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215 */ |
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216 public BlockBegin splitEdge(BlockBegin source, BlockBegin target) { |
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217 int bci = -2; |
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218 |
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219 int backEdgeIndex = target.predecessors().indexOf(source.end()); |
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220 |
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221 // create new successor and mark it for special block order treatment |
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222 BlockBegin newSucc = new BlockBegin(bci, nextBlockNumber(), false, compilation.graph); |
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223 |
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224 List<Integer> removePhiInputs = null; |
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225 for (int i = backEdgeIndex + 1; i < target.predecessors().size(); ++i) { |
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226 if (target.predecessors().get(i) == source.end()) { |
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227 if (removePhiInputs == null) { |
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228 removePhiInputs = new ArrayList<Integer>(); |
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229 } |
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230 removePhiInputs.add(i); |
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231 } |
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232 } |
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233 |
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234 // This goto is not a safepoint. |
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235 Goto e = new Goto(target, compilation.graph); |
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236 newSucc.appendNext(e); |
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237 e.reorderSuccessor(0, backEdgeIndex); |
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238 |
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239 // link predecessor to new block |
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240 source.end().substituteSuccessor(target, newSucc); |
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241 if (removePhiInputs != null && removePhiInputs.size() > 0) { |
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242 |
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243 for (Node n : target.usages()) { |
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244 if (n instanceof Phi) { |
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245 Phi phi = (Phi) n; |
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246 int correction = 0; |
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247 for (int index : removePhiInputs) { |
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248 phi.removeInput(index - correction); |
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249 correction++; |
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250 } |
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251 } |
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252 } |
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253 |
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254 } |
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255 |
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256 return newSucc; |
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257 } |
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258 |
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259 public int nextBlockNumber() { |
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260 return compilation.stats.blockCount++; |
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261 } |
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262 |
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263 public int numberOfBlocks() { |
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264 return compilation.stats.blockCount; |
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265 } |
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266 |
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267 public int numLoops() { |
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268 return compilation.stats.loopCount; |
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269 } |
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270 |
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271 /** |
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272 * Updates the maximum number of locks held at any one time. |
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273 * |
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274 * @param locks a lock count that will replace the current {@linkplain #maxLocks() max locks} if it is greater |
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275 */ |
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276 public void updateMaxLocks(int locks) { |
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277 if (locks > maxLocks) { |
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278 maxLocks = locks; |
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279 } |
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280 } |
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281 |
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282 /** |
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283 * Gets the number of locks. |
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284 * @return the number of locks |
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285 */ |
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286 public final int maxLocks() { |
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287 return maxLocks; |
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288 } |
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289 |
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290 public Instruction getHIRStartBlock() { |
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291 return (Instruction) compilation.graph.start().successors().get(0); |
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292 } |
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293 } |