Mercurial > hg > truffle
annotate graal/GraalCompiler/src/com/sun/c1x/ir/BlockBegin.java @ 2773:27512ea6bbcb
exception dispatch simplification:
* BlockMap creates exception dispatch blocks (so they're iterated in the right order)
* GraphBuilder uses exception dispatch blocks, simplified handleException, removed updateDispatchChain
* simplified mergeOrClone
* removed successor & predecessor methods from BlockBegin
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Tue, 24 May 2011 12:07:17 +0200 |
parents | 43ffa0e47a46 |
children | 93ec3f067420 bda5972a40a5 |
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.ir; |
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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.sun.c1x.debug.*; |
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29 import com.sun.c1x.util.*; |
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30 import com.sun.c1x.value.*; |
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31 import com.sun.cri.ci.*; |
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32 |
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33 /** |
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34 * Denotes the beginning of a basic block, and holds information |
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35 * about the basic block, including the successor and |
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36 * predecessor blocks, exception handlers, liveness information, etc. |
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37 */ |
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38 public final class BlockBegin extends StateSplit { |
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39 |
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40 private static final int INPUT_COUNT = 1; |
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41 private static final int INPUT_STATE_BEFORE = 0; |
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42 |
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43 private static final int SUCCESSOR_COUNT = 0; |
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44 |
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45 @Override |
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46 protected int inputCount() { |
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47 return super.inputCount() + INPUT_COUNT; |
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48 } |
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49 |
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50 @Override |
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51 protected int successorCount() { |
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52 return super.successorCount() + SUCCESSOR_COUNT; |
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53 } |
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54 |
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55 /** |
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56 * The last node in the block (which contains the successors). |
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57 */ |
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58 public BlockEnd end() { |
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59 Instruction next = next(); |
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60 while (!(next instanceof BlockEnd)) { |
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61 next = next.next(); |
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62 } |
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63 return (BlockEnd) next; |
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64 } |
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65 |
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66 @Override |
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67 public boolean needsStateAfter() { |
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68 return false; |
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69 } |
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70 |
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71 /** |
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72 * A unique id used in tracing. |
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73 */ |
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74 public final int blockID; |
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75 |
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76 public final boolean isLoopHeader; |
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77 private int linearScanNumber; |
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78 |
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79 /** |
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80 * Index of bytecode that generated this node when appended in a basic block. |
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81 * Negative values indicate special cases. |
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82 */ |
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83 private int bci; |
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84 |
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85 /** |
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86 * Constructs a new BlockBegin at the specified bytecode index. |
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87 * @param bci the bytecode index of the start |
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88 * @param blockID the ID of the block |
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89 * @param graph |
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90 */ |
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91 public BlockBegin(int bci, int blockID, boolean isLoopHeader, Graph graph) { |
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92 super(CiKind.Illegal, INPUT_COUNT, SUCCESSOR_COUNT, graph); |
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93 this.blockID = blockID; |
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94 linearScanNumber = -1; |
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96 this.isLoopHeader = isLoopHeader; |
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97 } |
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98 |
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99 /** |
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100 * Gets the linear scan number of this block. |
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101 * @return the linear scan number |
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102 */ |
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103 public int linearScanNumber() { |
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104 return linearScanNumber; |
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105 } |
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106 |
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107 public void setLinearScanNumber(int linearScanNumber) { |
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108 this.linearScanNumber = linearScanNumber; |
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109 } |
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110 |
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111 /** |
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112 * Iterate over this block, its exception handlers, and its successors, in that order. |
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113 * @param closure the closure to apply to each block |
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114 */ |
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115 public void iteratePreOrder(BlockClosure closure) { |
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116 // XXX: identity hash map might be too slow, consider a boolean array or a mark field |
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117 iterate(new IdentityHashMap<BlockBegin, BlockBegin>(), closure); |
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118 } |
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119 |
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120 /** |
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121 * Gets the bytecode index of this instruction. |
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122 * @return the bytecode index of this instruction |
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123 */ |
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124 public int bci() { |
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125 return bci; |
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126 } |
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127 |
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128 private void iterate(IdentityHashMap<BlockBegin, BlockBegin> mark, BlockClosure closure) { |
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129 if (!mark.containsKey(this)) { |
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130 mark.put(this, this); |
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131 closure.apply(this); |
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132 BlockEnd e = end(); |
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133 |
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134 Instruction inst = this; |
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135 ArrayList<BlockBegin> excBlocks = new ArrayList<BlockBegin>(); |
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136 while (inst != null) { |
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137 if (inst instanceof ExceptionEdgeInstruction) { |
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138 excBlocks.add(((ExceptionEdgeInstruction) inst).exceptionEdge()); |
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139 } |
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140 inst = inst.next(); |
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141 } |
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142 while (excBlocks.remove(null)) { |
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143 // nothing |
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144 } |
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145 if (excBlocks.size() > 0) { |
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146 iterateReverse(mark, closure, excBlocks); |
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147 } |
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148 |
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149 assert e != null : "block must have block end"; |
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150 iterateReverse(mark, closure, e.blockSuccessors()); |
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151 } |
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152 } |
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153 |
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154 private void iterateReverse(IdentityHashMap<BlockBegin, BlockBegin> mark, BlockClosure closure, List<BlockBegin> list) { |
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155 for (int i = list.size() - 1; i >= 0; i--) { |
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156 list.get(i).iterate(mark, closure); |
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157 } |
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158 } |
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159 |
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160 @Override |
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161 public void accept(ValueVisitor v) { |
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162 v.visitBlockBegin(this); |
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163 } |
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164 |
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165 @Override |
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166 public String toString() { |
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167 StringBuilder builder = new StringBuilder(); |
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168 builder.append("block #"); |
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169 builder.append(blockID); |
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170 builder.append(","); |
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171 builder.append(blockID); // was: depthFirstNumber |
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172 builder.append(" ["); |
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173 |
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174 builder.append("]"); |
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175 if (end() != null) { |
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176 builder.append(" -> "); |
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177 boolean hasSucc = false; |
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178 for (BlockBegin s : end().blockSuccessors()) { |
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179 if (hasSucc) { |
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180 builder.append(", "); |
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181 } |
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182 builder.append("#"); |
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183 builder.append(s.blockID); |
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184 hasSucc = true; |
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185 } |
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186 } |
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187 return builder.toString(); |
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188 } |
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189 |
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190 public void printWithoutPhis(LogStream out) { |
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191 // print block id |
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192 BlockEnd end = end(); |
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193 out.print("B").print(blockID).print(" "); |
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194 |
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195 // print flags |
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196 StringBuilder sb = new StringBuilder(8); |
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197 if (sb.length() != 0) { |
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198 out.print('(').print(sb.toString()).print(')'); |
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199 } |
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200 |
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201 // print block bci range |
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202 out.print('[').print(-1).print(", ").print(-1).print(']'); |
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203 |
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204 // print block successors |
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205 if (end != null && end.blockSuccessors().size() > 0) { |
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206 out.print(" ."); |
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207 for (BlockBegin successor : end.blockSuccessors()) { |
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208 out.print(" B").print(successor.blockID); |
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209 } |
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210 } |
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211 |
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212 // print predecessors |
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213 if (!blockPredecessors().isEmpty()) { |
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214 out.print(" pred:"); |
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215 for (Instruction pred : blockPredecessors()) { |
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216 out.print(" B").print(pred.block().blockID); |
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217 } |
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218 } |
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219 } |
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220 |
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221 @Override |
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222 public void print(LogStream out) { |
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223 |
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224 printWithoutPhis(out); |
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225 |
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226 // print phi functions |
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227 boolean hasPhisInLocals = false; |
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228 boolean hasPhisOnStack = false; |
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229 |
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230 if (end() != null && end().stateAfter() != null) { |
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231 FrameState state = stateBefore(); |
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232 |
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233 int i = 0; |
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234 while (!hasPhisOnStack && i < state.stackSize()) { |
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235 Value value = state.stackAt(i); |
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236 hasPhisOnStack = isPhiAtBlock(value); |
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237 if (value != null && !value.isIllegal()) { |
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238 i += value.kind.sizeInSlots(); |
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239 } else { |
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240 i++; |
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241 } |
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242 } |
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243 |
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244 for (i = 0; !hasPhisInLocals && i < state.localsSize();) { |
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245 Value value = state.localAt(i); |
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246 hasPhisInLocals = isPhiAtBlock(value); |
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247 // also ignore illegal HiWords |
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248 if (value != null && !value.isIllegal()) { |
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249 i += value.kind.sizeInSlots(); |
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250 } else { |
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251 i++; |
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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 // print values in locals |
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257 if (hasPhisInLocals) { |
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258 out.println(); |
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259 out.println("Locals:"); |
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260 |
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261 FrameState state = stateBefore(); |
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262 int i = 0; |
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263 while (i < state.localsSize()) { |
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264 Value value = state.localAt(i); |
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265 if (value != null) { |
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266 out.println(stateString(i, value)); |
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267 // also ignore illegal HiWords |
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268 i += value.isIllegal() ? 1 : value.kind.sizeInSlots(); |
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269 } else { |
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270 i++; |
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271 } |
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272 } |
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273 out.println(); |
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274 } |
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275 |
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276 // print values on stack |
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277 if (hasPhisOnStack) { |
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278 out.println(); |
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279 out.println("Stack:"); |
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280 int i = 0; |
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281 while (i < stateBefore().stackSize()) { |
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282 Value value = stateBefore().stackAt(i); |
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283 if (value != null) { |
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284 out.println(stateString(i, value)); |
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285 i += value.kind.sizeInSlots(); |
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286 } else { |
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287 i++; |
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288 } |
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289 } |
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290 } |
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291 |
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292 } |
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293 |
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294 /** |
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295 * Determines if a given instruction is a phi whose {@linkplain Phi#block() join block} is a given block. |
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296 * |
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297 * @param value the instruction to test |
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298 * @param block the block that may be the join block of {@code value} if {@code value} is a phi |
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299 * @return {@code true} if {@code value} is a phi and its join block is {@code block} |
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300 */ |
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301 private boolean isPhiAtBlock(Value value) { |
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302 return value instanceof Phi && ((Phi) value).block() == this; |
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303 } |
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304 |
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305 |
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306 /** |
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307 * Formats a given instruction as a value in a {@linkplain FrameState frame state}. If the instruction is a phi defined at a given |
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308 * block, its {@linkplain Phi#valueCount() inputs} are appended to the returned string. |
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309 * |
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310 * @param index the index of the value in the frame state |
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311 * @param value the frame state value |
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312 * @param block if {@code value} is a phi, then its inputs are formatted if {@code block} is its |
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313 * {@linkplain Phi#block() join point} |
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314 * @return the instruction representation as a string |
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315 */ |
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316 public String stateString(int index, Value value) { |
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317 StringBuilder sb = new StringBuilder(30); |
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318 sb.append(String.format("%2d %s", index, Util.valueString(value))); |
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319 if (value instanceof Phi) { |
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320 Phi phi = (Phi) value; |
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321 // print phi operands |
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322 if (phi.block() == this) { |
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323 sb.append(" ["); |
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324 for (int j = 0; j < phi.valueCount(); j++) { |
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325 sb.append(' '); |
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326 Value operand = phi.valueAt(j); |
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327 if (operand != null) { |
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328 sb.append(Util.valueString(operand)); |
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329 } else { |
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330 sb.append("NULL"); |
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331 } |
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332 } |
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333 sb.append("] "); |
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334 } |
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335 } |
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336 if (value != null && value.hasSubst()) { |
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337 sb.append("alias ").append(Util.valueString(value.subst())); |
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338 } |
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339 return sb.toString(); |
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340 } |
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341 |
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342 @Override |
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343 public String shortName() { |
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344 return "BlockBegin #" + blockID; |
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345 } |
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346 |
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347 /** |
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348 * Iterates over all successors of this block: successors of the end node and exception handler. |
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349 */ |
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350 public void allSuccessorsDo(boolean backwards, BlockClosure closure) { |
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351 BlockEnd end = end(); |
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352 if (backwards) { |
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353 for (int i = end.blockSuccessorCount() - 1; i >= 0; i--) { |
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354 closure.apply(end.blockSuccessor(i)); |
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355 } |
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356 } else { |
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357 for (int i = 0; i < end.blockSuccessorCount(); i++) { |
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358 closure.apply(end.blockSuccessor(i)); |
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359 } |
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360 } |
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361 for (Instruction x = next(); x != null; x = x.next()) { |
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362 if (x instanceof ExceptionEdgeInstruction && ((ExceptionEdgeInstruction) x).exceptionEdge() != null) { |
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363 closure.apply(((ExceptionEdgeInstruction) x).exceptionEdge()); |
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364 } |
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365 } |
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366 } |
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367 } |