Mercurial > hg > truffle
annotate graal/GraalCompiler/src/com/sun/c1x/ir/BlockBegin.java @ 2756:bfcdda4fdd73
Removed the direct connection between BlockBegin and BlockEnd.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Fri, 20 May 2011 14:51:45 +0200 |
parents | 0d268cf66e24 |
children | b72e6638b9e6 |
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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.lir.*; |
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30 import com.sun.c1x.util.*; |
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31 import com.sun.c1x.value.*; |
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32 import com.sun.cri.ci.*; |
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33 |
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34 /** |
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35 * Denotes the beginning of a basic block, and holds information |
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36 * about the basic block, including the successor and |
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37 * predecessor blocks, exception handlers, liveness information, etc. |
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38 */ |
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39 public final class BlockBegin extends StateSplit { |
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40 |
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41 private static final int INPUT_COUNT = 1; |
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42 private static final int INPUT_STATE_BEFORE = 0; |
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43 |
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44 private static final int SUCCESSOR_COUNT = 0; |
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45 |
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46 @Override |
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47 protected int inputCount() { |
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48 return super.inputCount() + INPUT_COUNT; |
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49 } |
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50 |
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51 @Override |
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52 protected int successorCount() { |
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53 return super.successorCount() + SUCCESSOR_COUNT; |
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54 } |
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55 |
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56 /** |
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57 * The last node in the block (which contains the successors). |
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58 */ |
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59 public BlockEnd end() { |
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60 Instruction next = next(); |
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61 while (!(next instanceof BlockEnd)) { |
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62 next = next.next(); |
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63 } |
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64 return (BlockEnd) next; |
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65 } |
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66 |
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67 @Override |
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68 public boolean needsStateAfter() { |
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69 return false; |
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70 } |
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71 |
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72 /** |
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73 * A unique id used in tracing. |
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74 */ |
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75 public final int blockID; |
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76 |
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77 private int linearScanNumber; |
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78 |
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79 // LIR block |
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80 public LIRBlock lirBlock; |
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81 |
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82 public void setLIRBlock(LIRBlock block) { |
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83 this.lirBlock = block; |
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84 } |
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85 |
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87 return lirBlock; | |
88 } | |
89 | |
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90 /** |
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91 * Index of bytecode that generated this node when appended in a basic block. |
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92 * Negative values indicate special cases. |
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93 */ |
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94 private int bci; |
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95 |
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96 /** |
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97 * Constructs a new BlockBegin at the specified bytecode index. |
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98 * @param bci the bytecode index of the start |
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99 * @param blockID the ID of the block |
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100 * @param graph |
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101 */ |
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102 public BlockBegin(int bci, int blockID, Graph graph) { |
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103 super(CiKind.Illegal, INPUT_COUNT, SUCCESSOR_COUNT, graph); |
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104 this.blockID = blockID; |
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105 linearScanNumber = -1; |
2727 | 106 this.bci = bci; |
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107 } |
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108 |
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109 /** |
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110 * Gets the list of predecessors of this block. |
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111 * @return the predecessor list |
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112 */ |
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113 @SuppressWarnings({ "unchecked", "rawtypes" }) |
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114 public List<Instruction> blockPredecessors() { |
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115 if (predecessors().size() == 1 && predecessors().get(0) == graph().start()) { |
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116 return Collections.EMPTY_LIST; |
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117 } else { |
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118 return (List) Collections.unmodifiableList(predecessors()); |
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119 } |
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120 } |
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121 |
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122 /** |
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123 * Gets the linear scan number of this block. |
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124 * @return the linear scan number |
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125 */ |
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126 public int linearScanNumber() { |
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127 return linearScanNumber; |
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128 } |
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129 |
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130 public void setLinearScanNumber(int linearScanNumber) { |
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131 this.linearScanNumber = linearScanNumber; |
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132 } |
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133 |
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134 /** |
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135 * Iterate over this block, its exception handlers, and its successors, in that order. |
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136 * @param closure the closure to apply to each block |
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137 */ |
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138 public void iteratePreOrder(BlockClosure closure) { |
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139 // XXX: identity hash map might be too slow, consider a boolean array or a mark field |
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140 iterate(new IdentityHashMap<BlockBegin, BlockBegin>(), closure); |
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141 } |
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142 |
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143 /** |
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144 * Gets the bytecode index of this instruction. |
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145 * @return the bytecode index of this instruction |
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146 */ |
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147 public int bci() { |
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148 return bci; |
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149 } |
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150 |
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151 private void iterate(IdentityHashMap<BlockBegin, BlockBegin> mark, BlockClosure closure) { |
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152 if (!mark.containsKey(this)) { |
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153 mark.put(this, this); |
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154 closure.apply(this); |
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155 BlockEnd e = end(); |
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156 |
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157 Instruction inst = this; |
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158 ArrayList<BlockBegin> excBlocks = new ArrayList<BlockBegin>(); |
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159 while (inst != null) { |
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160 if (inst instanceof Invoke) { |
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161 excBlocks.add(((Invoke) inst).exceptionEdge()); |
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162 } else if (inst instanceof Throw) { |
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163 excBlocks.add(((Throw) inst).exceptionEdge()); |
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164 } |
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165 inst = inst.next(); |
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166 } |
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167 while (excBlocks.remove(null)) { |
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168 // nothing |
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169 } |
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170 if (excBlocks.size() > 0) { |
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171 iterateReverse(mark, closure, excBlocks); |
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172 } |
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173 |
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174 assert e != null : "block must have block end"; |
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175 iterateReverse(mark, closure, e.blockSuccessors()); |
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176 } |
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177 } |
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178 |
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179 private void iterateReverse(IdentityHashMap<BlockBegin, BlockBegin> mark, BlockClosure closure, List<BlockBegin> list) { |
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180 for (int i = list.size() - 1; i >= 0; i--) { |
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181 list.get(i).iterate(mark, closure); |
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182 } |
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183 } |
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184 |
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185 @Override |
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186 public void accept(ValueVisitor v) { |
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187 v.visitBlockBegin(this); |
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188 } |
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189 |
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190 @Override |
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191 public String toString() { |
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192 StringBuilder builder = new StringBuilder(); |
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193 builder.append("block #"); |
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194 builder.append(blockID); |
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195 builder.append(","); |
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196 builder.append(blockID); // was: depthFirstNumber |
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197 builder.append(" ["); |
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198 |
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199 builder.append("]"); |
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200 if (end() != null) { |
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201 builder.append(" -> "); |
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202 boolean hasSucc = false; |
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203 for (BlockBegin s : end().blockSuccessors()) { |
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204 if (hasSucc) { |
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205 builder.append(", "); |
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206 } |
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207 builder.append("#"); |
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208 builder.append(s.blockID); |
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209 hasSucc = true; |
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210 } |
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211 } |
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212 return builder.toString(); |
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213 } |
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214 |
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215 /** |
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216 * Get the number of successors. |
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217 * @return the number of successors |
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218 */ |
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219 public int numberOfSux() { |
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220 return end().blockSuccessorCount(); |
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221 } |
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222 |
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223 /** |
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224 * Get the successor at a certain position. |
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225 * @param i the position |
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226 * @return the successor |
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227 */ |
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228 public BlockBegin suxAt(int i) { |
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229 return end().blockSuccessor(i); |
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230 } |
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231 |
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232 /** |
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233 * Get the number of predecessors. |
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234 * @return the number of predecessors |
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235 */ |
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236 public int numberOfPreds() { |
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237 // ignore the graph root |
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238 if (predecessors().size() == 1 && predecessors().get(0) == graph().start()) { |
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239 return 0; |
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240 } else { |
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241 return predecessors().size(); |
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242 } |
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243 } |
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244 |
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245 public Instruction predAt(int j) { |
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246 return (Instruction) predecessors().get(j); |
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247 } |
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248 |
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249 public void printWithoutPhis(LogStream out) { |
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250 // print block id |
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251 BlockEnd end = end(); |
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252 out.print("B").print(blockID).print(" "); |
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253 |
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254 // print flags |
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255 StringBuilder sb = new StringBuilder(8); |
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256 if (sb.length() != 0) { |
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257 out.print('(').print(sb.toString()).print(')'); |
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258 } |
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259 |
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260 // print block bci range |
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261 out.print('[').print(-1).print(", ").print(-1).print(']'); |
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262 |
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263 // print block successors |
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264 if (end != null && end.blockSuccessors().size() > 0) { |
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265 out.print(" ."); |
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266 for (BlockBegin successor : end.blockSuccessors()) { |
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267 out.print(" B").print(successor.blockID); |
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268 } |
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269 } |
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270 |
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271 // print predecessors |
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272 if (!blockPredecessors().isEmpty()) { |
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273 out.print(" pred:"); |
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274 for (Instruction pred : blockPredecessors()) { |
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275 out.print(" B").print(pred.block().blockID); |
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276 } |
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277 } |
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278 } |
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279 |
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280 @Override |
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281 public void print(LogStream out) { |
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282 |
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283 printWithoutPhis(out); |
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284 |
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285 // print phi functions |
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286 boolean hasPhisInLocals = false; |
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287 boolean hasPhisOnStack = false; |
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288 |
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289 if (end() != null && end().stateAfter() != null) { |
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290 FrameState state = stateBefore(); |
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291 |
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292 int i = 0; |
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293 while (!hasPhisOnStack && i < state.stackSize()) { |
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294 Value value = state.stackAt(i); |
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295 hasPhisOnStack = isPhiAtBlock(value); |
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296 if (value != null && !value.isIllegal()) { |
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297 i += value.kind.sizeInSlots(); |
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298 } else { |
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299 i++; |
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300 } |
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301 } |
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302 |
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303 for (i = 0; !hasPhisInLocals && i < state.localsSize();) { |
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304 Value value = state.localAt(i); |
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305 hasPhisInLocals = isPhiAtBlock(value); |
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306 // also ignore illegal HiWords |
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307 if (value != null && !value.isIllegal()) { |
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308 i += value.kind.sizeInSlots(); |
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309 } else { |
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310 i++; |
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311 } |
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312 } |
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313 } |
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314 |
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315 // print values in locals |
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316 if (hasPhisInLocals) { |
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317 out.println(); |
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318 out.println("Locals:"); |
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319 |
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320 FrameState state = stateBefore(); |
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321 int i = 0; |
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322 while (i < state.localsSize()) { |
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323 Value value = state.localAt(i); |
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324 if (value != null) { |
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325 out.println(stateString(i, value)); |
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326 // also ignore illegal HiWords |
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327 i += value.isIllegal() ? 1 : value.kind.sizeInSlots(); |
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328 } else { |
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329 i++; |
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330 } |
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331 } |
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332 out.println(); |
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333 } |
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334 |
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335 // print values on stack |
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336 if (hasPhisOnStack) { |
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337 out.println(); |
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338 out.println("Stack:"); |
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339 int i = 0; |
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340 while (i < stateBefore().stackSize()) { |
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341 Value value = stateBefore().stackAt(i); |
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342 if (value != null) { |
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343 out.println(stateString(i, value)); |
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344 i += value.kind.sizeInSlots(); |
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345 } else { |
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346 i++; |
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347 } |
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348 } |
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349 } |
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350 |
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351 } |
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352 |
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353 /** |
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354 * Determines if a given instruction is a phi whose {@linkplain Phi#block() join block} is a given block. |
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355 * |
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356 * @param value the instruction to test |
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357 * @param block the block that may be the join block of {@code value} if {@code value} is a phi |
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358 * @return {@code true} if {@code value} is a phi and its join block is {@code block} |
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359 */ |
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360 private boolean isPhiAtBlock(Value value) { |
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361 return value instanceof Phi && ((Phi) value).block() == this; |
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362 } |
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363 |
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364 |
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365 /** |
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366 * 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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367 * block, its {@linkplain Phi#phiInputCount() inputs} are appended to the returned string. |
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368 * |
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369 * @param index the index of the value in the frame state |
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370 * @param value the frame state value |
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371 * @param block if {@code value} is a phi, then its inputs are formatted if {@code block} is its |
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372 * {@linkplain Phi#block() join point} |
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373 * @return the instruction representation as a string |
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374 */ |
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375 public String stateString(int index, Value value) { |
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376 StringBuilder sb = new StringBuilder(30); |
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377 sb.append(String.format("%2d %s", index, Util.valueString(value))); |
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378 if (value instanceof Phi) { |
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379 Phi phi = (Phi) value; |
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380 // print phi operands |
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381 if (phi.block() == this) { |
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382 sb.append(" ["); |
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383 for (int j = 0; j < phi.phiInputCount(); j++) { |
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384 sb.append(' '); |
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385 Value operand = phi.inputAt(j); |
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386 if (operand != null) { |
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387 sb.append(Util.valueString(operand)); |
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388 } else { |
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389 sb.append("NULL"); |
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390 } |
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391 } |
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392 sb.append("] "); |
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393 } |
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394 } |
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395 if (value != null && value.hasSubst()) { |
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396 sb.append("alias ").append(Util.valueString(value.subst())); |
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397 } |
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398 return sb.toString(); |
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399 } |
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400 |
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401 @Override |
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402 public String shortName() { |
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403 return "BlockBegin #" + blockID; |
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404 } |
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405 |
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406 /** |
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407 * Iterates over all successors of this block: successors of the end node and exception handler. |
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408 */ |
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409 public void allSuccessorsDo(boolean backwards, BlockClosure closure) { |
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410 if (backwards) { |
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411 for (int i = numberOfSux() - 1; i >= 0; i--) { |
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412 closure.apply(suxAt(i)); |
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413 } |
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414 } else { |
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415 for (int i = 0; i < numberOfSux(); i++) { |
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416 closure.apply(suxAt(i)); |
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417 } |
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418 } |
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419 for (Instruction x = next(); x != null; x = x.next()) { |
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420 if (x instanceof ExceptionEdgeInstruction && ((ExceptionEdgeInstruction) x).exceptionEdge() != null) { |
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421 closure.apply(((ExceptionEdgeInstruction) x).exceptionEdge()); |
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422 } |
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423 } |
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424 } |
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425 } |