Mercurial > hg > truffle
annotate graal/GraalCompiler/src/com/sun/c1x/ir/BlockBegin.java @ 2732:beea26b73b3f
Removed unused options and code.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Thu, 19 May 2011 17:31:01 +0200 |
parents | a2f62de90c76 |
children | 2ef23785ca93 |
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.*; |
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29 import com.sun.c1x.debug.*; |
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30 import com.sun.c1x.lir.*; |
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31 import com.sun.c1x.util.*; |
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32 import com.sun.c1x.value.*; |
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33 import com.sun.cri.ci.*; |
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34 import com.sun.cri.ri.*; |
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35 |
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36 /** |
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37 * Denotes the beginning of a basic block, and holds information |
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38 * about the basic block, including the successor and |
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39 * predecessor blocks, exception handlers, liveness information, etc. |
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40 */ |
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41 public final class BlockBegin extends StateSplit { |
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42 |
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43 private static final int INPUT_COUNT = 1; |
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44 private static final int INPUT_STATE_BEFORE = 0; |
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45 |
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46 private static final int SUCCESSOR_COUNT = 1; |
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47 private static final int SUCCESSOR_END = 0; |
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48 |
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49 @Override |
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50 protected int inputCount() { |
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51 return super.inputCount() + INPUT_COUNT; |
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52 } |
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53 |
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54 @Override |
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55 protected int successorCount() { |
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56 return super.successorCount() + SUCCESSOR_COUNT; |
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57 } |
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58 |
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59 /** |
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60 * The last node in the block (which contains the successors). |
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61 */ |
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62 public BlockEnd end() { |
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63 return (BlockEnd) successors().get(super.successorCount() + SUCCESSOR_END); |
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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 public void setEnd(BlockEnd end) { |
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72 assert end != null; |
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73 successors().set(super.successorCount() + SUCCESSOR_END, end); |
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74 } |
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75 |
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76 /** |
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77 * A unique id used in tracing. |
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78 */ |
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79 public final int blockID; |
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80 |
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81 private int depthFirstNumber; |
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82 private int linearScanNumber; |
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83 |
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84 // LIR block |
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85 private LIRBlock lirBlock; |
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86 |
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87 public void setLIRBlock(LIRBlock block) { |
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88 this.lirBlock = block; |
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89 } |
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90 |
2726 | 91 public LIRBlock lirBlock() { |
92 return lirBlock; | |
93 } | |
94 | |
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95 /** |
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96 * Index of bytecode that generated this node when appended in a basic block. |
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97 * Negative values indicate special cases. |
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98 */ |
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99 private int bci; |
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100 |
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101 /** |
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102 * Constructs a new BlockBegin at the specified bytecode index. |
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103 * @param bci the bytecode index of the start |
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104 * @param blockID the ID of the block |
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105 * @param graph |
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106 */ |
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107 public BlockBegin(int bci, int blockID, Graph graph) { |
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108 super(CiKind.Illegal, INPUT_COUNT, SUCCESSOR_COUNT, graph); |
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109 this.blockID = blockID; |
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110 depthFirstNumber = -1; |
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111 linearScanNumber = -1; |
2727 | 112 this.bci = bci; |
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113 } |
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114 |
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115 /** |
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116 * Gets the list of predecessors of this block. |
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117 * @return the predecessor list |
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118 */ |
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119 @SuppressWarnings({ "unchecked", "rawtypes" }) |
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120 public List<Instruction> blockPredecessors() { |
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121 if (predecessors().size() == 1 && predecessors().get(0) == graph().root()) { |
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122 return Collections.EMPTY_LIST; |
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123 } else { |
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124 return (List) Collections.unmodifiableList(predecessors()); |
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125 } |
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126 } |
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127 |
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128 /** |
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129 * Gets the depth first traversal number of this block. |
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130 * @return the depth first number |
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131 */ |
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132 public int depthFirstNumber() { |
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133 return depthFirstNumber; |
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134 } |
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135 |
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136 /** |
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137 * Gets the linear scan number of this block. |
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138 * @return the linear scan number |
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139 */ |
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140 public int linearScanNumber() { |
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141 return linearScanNumber; |
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142 } |
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143 |
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144 public void setDepthFirstNumber(int depthFirstNumber) { |
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145 assert depthFirstNumber >= 0; |
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146 this.depthFirstNumber = depthFirstNumber; |
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147 } |
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148 |
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149 public void setLinearScanNumber(int linearScanNumber) { |
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150 this.linearScanNumber = linearScanNumber; |
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151 } |
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152 |
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153 /** |
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154 * Iterate over this block, its exception handlers, and its successors, in that order. |
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155 * @param closure the closure to apply to each block |
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156 */ |
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157 public void iteratePreOrder(BlockClosure closure) { |
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158 // XXX: identity hash map might be too slow, consider a boolean array or a mark field |
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159 iterate(new IdentityHashMap<BlockBegin, BlockBegin>(), closure); |
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160 } |
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161 |
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162 /** |
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163 * Iterate over all blocks transitively reachable from this block. |
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164 * @param closure the closure to apply to each block |
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165 * @param predecessors {@code true} if also to include this blocks predecessors |
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166 */ |
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167 public void iterateAnyOrder(BlockClosure closure, boolean predecessors) { |
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168 IdentityHashMap<BlockBegin, BlockBegin> mark = new IdentityHashMap<BlockBegin, BlockBegin>(); |
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169 LinkedList<BlockBegin> queue = new LinkedList<BlockBegin>(); |
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170 queue.offer(this); |
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171 mark.put(this, this); |
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172 BlockBegin block; |
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173 while ((block = queue.poll()) != null) { |
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174 closure.apply(block); |
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175 |
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176 Instruction inst = block; |
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177 ArrayList<BlockBegin> excBlocks = new ArrayList<BlockBegin>(); |
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178 while (inst != null) { |
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179 if (inst instanceof ExceptionEdgeInstruction) { |
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180 excBlocks.add(((ExceptionEdgeInstruction) inst).exceptionEdge()); |
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181 } |
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182 inst = inst.next(); |
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183 } |
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184 while (excBlocks.remove(null)) { |
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185 // nothing |
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186 } |
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187 if (excBlocks.size() > 0) { |
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188 queueBlocks(queue, excBlocks, mark); |
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189 } |
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190 |
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191 queueBlocks(queue, block.end().blockSuccessors(), mark); |
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192 if (predecessors) { |
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193 queueBlockEnds(queue, block.blockPredecessors(), mark); |
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194 } |
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195 } |
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196 } |
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197 |
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198 private void queueBlocks(LinkedList<BlockBegin> queue, List<BlockBegin> list, IdentityHashMap<BlockBegin, BlockBegin> mark) { |
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199 if (list != null) { |
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200 for (BlockBegin b : list) { |
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201 if (!mark.containsKey(b)) { |
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202 queue.offer(b); |
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203 mark.put(b, b); |
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204 } |
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205 } |
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206 } |
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207 } |
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208 |
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209 private void queueBlockEnds(LinkedList<BlockBegin> queue, List<Instruction> list, IdentityHashMap<BlockBegin, BlockBegin> mark) { |
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210 if (list != null) { |
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211 for (Instruction end : list) { |
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212 BlockBegin b = end.block(); |
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213 if (!mark.containsKey(b)) { |
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214 queue.offer(b); |
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215 mark.put(b, b); |
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216 } |
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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 /** |
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222 * Gets the bytecode index of this instruction. |
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223 * @return the bytecode index of this instruction |
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224 */ |
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225 public int bci() { |
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226 return bci; |
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227 } |
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228 |
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229 private void iterate(IdentityHashMap<BlockBegin, BlockBegin> mark, BlockClosure closure) { |
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230 if (!mark.containsKey(this)) { |
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231 mark.put(this, this); |
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232 closure.apply(this); |
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233 BlockEnd e = end(); |
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234 |
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235 Instruction inst = this; |
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236 ArrayList<BlockBegin> excBlocks = new ArrayList<BlockBegin>(); |
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237 while (inst != null) { |
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238 if (inst instanceof Invoke) { |
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239 excBlocks.add(((Invoke) inst).exceptionEdge()); |
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240 } else if (inst instanceof Throw) { |
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241 excBlocks.add(((Throw) inst).exceptionEdge()); |
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242 } |
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243 inst = inst.next(); |
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244 } |
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245 while (excBlocks.remove(null)) { |
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246 // nothing |
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247 } |
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248 if (excBlocks.size() > 0) { |
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249 iterateReverse(mark, closure, excBlocks); |
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250 } |
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251 |
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252 assert e != null : "block must have block end"; |
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253 iterateReverse(mark, closure, e.blockSuccessors()); |
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254 } |
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255 } |
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256 |
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257 private void iterateReverse(IdentityHashMap<BlockBegin, BlockBegin> mark, BlockClosure closure, List<BlockBegin> list) { |
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258 for (int i = list.size() - 1; i >= 0; i--) { |
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259 list.get(i).iterate(mark, closure); |
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260 } |
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261 } |
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262 |
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263 @Override |
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264 public void accept(ValueVisitor v) { |
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265 v.visitBlockBegin(this); |
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266 } |
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267 |
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268 public void mergeOrClone(FrameStateAccess newState, RiMethod method) { |
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269 FrameState existingState = stateBefore(); |
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270 |
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271 if (existingState == null) { |
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272 // copy state because it is modified |
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273 FrameState duplicate = newState.duplicate(bci()); |
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274 |
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275 // if the block is a loop header, insert all necessary phis |
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276 if (isParserLoopHeader()) { |
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277 insertLoopPhis(duplicate); |
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278 } |
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279 |
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280 setStateBefore(duplicate); |
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281 } else { |
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282 if (!C1XOptions.AssumeVerifiedBytecode && !existingState.isCompatibleWith(newState)) { |
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283 // stacks or locks do not match--bytecodes would not verify |
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284 throw new CiBailout("stack or locks do not match"); |
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285 } |
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286 |
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287 assert existingState.localsSize() == newState.localsSize(); |
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288 assert existingState.stackSize() == newState.stackSize(); |
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289 |
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290 existingState.merge(this, newState); |
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291 } |
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292 } |
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293 |
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294 private void insertLoopPhis(FrameState newState) { |
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295 int stackSize = newState.stackSize(); |
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296 for (int i = 0; i < stackSize; i++) { |
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297 // always insert phis for the stack |
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298 newState.setupPhiForStack(this, i); |
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299 } |
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300 int localsSize = newState.localsSize(); |
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301 for (int i = 0; i < localsSize; i++) { |
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302 Value x = newState.localAt(i); |
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303 if (x != null) { |
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304 newState.setupPhiForLocal(this, i); |
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305 } |
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306 } |
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307 } |
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308 |
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309 boolean parserLoopHeader; |
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310 |
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311 public boolean isParserLoopHeader() { |
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312 return parserLoopHeader; |
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313 } |
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314 |
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315 public void setParserLoopHeader(boolean value) { |
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316 parserLoopHeader = value; |
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317 } |
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318 |
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319 @Override |
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320 public String toString() { |
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321 StringBuilder builder = new StringBuilder(); |
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322 builder.append("block #"); |
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323 builder.append(blockID); |
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324 builder.append(","); |
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325 builder.append(depthFirstNumber); |
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326 builder.append(" ["); |
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327 |
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328 builder.append("]"); |
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329 if (end() != null) { |
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330 builder.append(" -> "); |
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331 boolean hasSucc = false; |
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332 for (BlockBegin s : end().blockSuccessors()) { |
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333 if (hasSucc) { |
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334 builder.append(", "); |
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335 } |
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336 builder.append("#"); |
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337 builder.append(s.blockID); |
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338 hasSucc = true; |
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339 } |
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340 } |
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341 return builder.toString(); |
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342 } |
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343 |
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344 /** |
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345 * Get the number of successors. |
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346 * @return the number of successors |
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347 */ |
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348 public int numberOfSux() { |
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349 return end().blockSuccessorCount(); |
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350 } |
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351 |
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352 /** |
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353 * Get the successor at a certain position. |
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354 * @param i the position |
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355 * @return the successor |
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356 */ |
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357 public BlockBegin suxAt(int i) { |
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358 return end().blockSuccessor(i); |
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359 } |
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360 |
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361 /** |
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362 * Get the number of predecessors. |
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363 * @return the number of predecessors |
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364 */ |
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365 public int numberOfPreds() { |
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366 // ignore the graph root |
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367 if (predecessors().size() == 1 && predecessors().get(0) == graph().root()) { |
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368 return 0; |
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369 } else { |
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370 return predecessors().size(); |
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371 } |
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372 } |
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373 |
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374 public Instruction predAt(int j) { |
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375 return (Instruction) predecessors().get(j); |
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376 } |
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377 |
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378 public void printWithoutPhis(LogStream out) { |
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379 // print block id |
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380 BlockEnd end = end(); |
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381 out.print("B").print(blockID).print(" "); |
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382 |
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383 // print flags |
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384 StringBuilder sb = new StringBuilder(8); |
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385 if (isParserLoopHeader()) { |
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386 sb.append("LH"); |
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387 } |
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388 if (sb.length() != 0) { |
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389 out.print('(').print(sb.toString()).print(')'); |
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390 } |
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391 |
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392 // print block bci range |
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393 out.print('[').print(-1).print(", ").print(-1).print(']'); |
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394 |
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395 // print block successors |
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396 if (end != null && end.blockSuccessors().size() > 0) { |
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397 out.print(" ."); |
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398 for (BlockBegin successor : end.blockSuccessors()) { |
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399 out.print(" B").print(successor.blockID); |
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400 } |
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401 } |
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402 |
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403 // print predecessors |
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404 if (!blockPredecessors().isEmpty()) { |
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405 out.print(" pred:"); |
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406 for (Instruction pred : blockPredecessors()) { |
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407 out.print(" B").print(pred.block().blockID); |
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408 } |
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409 } |
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410 } |
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411 |
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412 @Override |
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413 public void print(LogStream out) { |
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414 |
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415 printWithoutPhis(out); |
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416 |
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417 // print phi functions |
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418 boolean hasPhisInLocals = false; |
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419 boolean hasPhisOnStack = false; |
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420 |
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421 if (end() != null && end().stateAfter() != null) { |
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422 FrameState state = stateBefore(); |
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423 |
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424 int i = 0; |
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425 while (!hasPhisOnStack && i < state.stackSize()) { |
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426 Value value = state.stackAt(i); |
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427 hasPhisOnStack = isPhiAtBlock(value); |
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428 if (value != null && !value.isIllegal()) { |
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429 i += value.kind.sizeInSlots(); |
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430 } else { |
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431 i++; |
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432 } |
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433 } |
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434 |
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435 for (i = 0; !hasPhisInLocals && i < state.localsSize();) { |
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436 Value value = state.localAt(i); |
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437 hasPhisInLocals = isPhiAtBlock(value); |
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438 // also ignore illegal HiWords |
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439 if (value != null && !value.isIllegal()) { |
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440 i += value.kind.sizeInSlots(); |
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441 } else { |
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442 i++; |
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443 } |
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444 } |
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445 } |
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446 |
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447 // print values in locals |
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448 if (hasPhisInLocals) { |
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449 out.println(); |
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450 out.println("Locals:"); |
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451 |
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452 FrameState state = stateBefore(); |
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453 int i = 0; |
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454 while (i < state.localsSize()) { |
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455 Value value = state.localAt(i); |
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456 if (value != null) { |
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457 out.println(stateString(i, value)); |
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458 // also ignore illegal HiWords |
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459 i += value.isIllegal() ? 1 : value.kind.sizeInSlots(); |
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460 } else { |
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461 i++; |
2507
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462 } |
2564
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463 } |
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464 out.println(); |
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465 } |
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466 |
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467 // print values on stack |
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468 if (hasPhisOnStack) { |
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469 out.println(); |
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470 out.println("Stack:"); |
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471 int i = 0; |
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472 while (i < stateBefore().stackSize()) { |
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473 Value value = stateBefore().stackAt(i); |
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474 if (value != null) { |
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475 out.println(stateString(i, value)); |
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476 i += value.kind.sizeInSlots(); |
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|
477 } else { |
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|
478 i++; |
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|
479 } |
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|
480 } |
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|
481 } |
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|
482 |
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|
483 } |
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|
484 |
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|
485 /** |
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486 * Determines if a given instruction is a phi whose {@linkplain Phi#block() join block} is a given block. |
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487 * |
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488 * @param value the instruction to test |
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489 * @param block the block that may be the join block of {@code value} if {@code value} is a phi |
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490 * @return {@code true} if {@code value} is a phi and its join block is {@code block} |
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491 */ |
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492 private boolean isPhiAtBlock(Value value) { |
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493 return value instanceof Phi && ((Phi) value).block() == this; |
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494 } |
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|
495 |
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|
496 |
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|
497 /** |
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498 * Formats a given instruction as a value in a {@linkplain FrameState frame state}. If the instruction is a phi defined at a given |
2582
768d77a1c7af
new node layout: Instruction
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499 * block, its {@linkplain Phi#phiInputCount() inputs} are appended to the returned string. |
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500 * |
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501 * @param index the index of the value in the frame state |
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502 * @param value the frame state value |
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503 * @param block if {@code value} is a phi, then its inputs are formatted if {@code block} is its |
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504 * {@linkplain Phi#block() join point} |
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505 * @return the instruction representation as a string |
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506 */ |
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507 public String stateString(int index, Value value) { |
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508 StringBuilder sb = new StringBuilder(30); |
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509 sb.append(String.format("%2d %s", index, Util.valueString(value))); |
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510 if (value instanceof Phi) { |
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511 Phi phi = (Phi) value; |
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512 // print phi operands |
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513 if (phi.block() == this) { |
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514 sb.append(" ["); |
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515 for (int j = 0; j < phi.phiInputCount(); j++) { |
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516 sb.append(' '); |
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517 Value operand = phi.inputAt(j); |
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518 if (operand != null) { |
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519 sb.append(Util.valueString(operand)); |
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520 } else { |
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521 sb.append("NULL"); |
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522 } |
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523 } |
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524 sb.append("] "); |
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525 } |
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526 } |
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527 if (value != null && value.hasSubst()) { |
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528 sb.append("alias ").append(Util.valueString(value.subst())); |
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529 } |
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530 return sb.toString(); |
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531 } |
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532 |
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533 @Override |
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534 public String shortName() { |
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535 return "BlockBegin #" + blockID; |
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536 } |
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537 |
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538 /** |
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539 * Iterates over all successors of this block: successors of the end node and exception handler. |
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540 */ |
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541 public void allSuccessorsDo(boolean backwards, BlockClosure closure) { |
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542 if (backwards) { |
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543 for (int i = numberOfSux() - 1; i >= 0; i--) { |
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544 closure.apply(suxAt(i)); |
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545 } |
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546 } else { |
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547 for (int i = 0; i < numberOfSux(); i++) { |
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548 closure.apply(suxAt(i)); |
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549 } |
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550 } |
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551 for (Instruction x = next(); x != null; x = x.next()) { |
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552 if (x instanceof ExceptionEdgeInstruction && ((ExceptionEdgeInstruction) x).exceptionEdge() != null) { |
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553 closure.apply(((ExceptionEdgeInstruction) x).exceptionEdge()); |
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554 } |
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555 } |
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556 } |
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557 } |