Mercurial > hg > graal-jvmci-8
annotate graal/GraalCompiler/src/com/sun/c1x/ir/BlockBegin.java @ 2728:7e470e1cd3b6
Removed special casing for exception phis in LIRGenerator. Removed dependency between LIRBlock.blockID and BlockBegin.blockID.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Thu, 19 May 2011 17:13:30 +0200 |
parents | 1ddcbcd33325 |
children | 108adba3345e |
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.oracle.max.asm.*; |
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29 import com.sun.c1x.*; |
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30 import com.sun.c1x.debug.*; |
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31 import com.sun.c1x.lir.*; |
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32 import com.sun.c1x.util.*; |
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33 import com.sun.c1x.value.*; |
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34 import com.sun.cri.ci.*; |
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35 import com.sun.cri.ri.*; |
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36 |
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37 /** |
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38 * Denotes the beginning of a basic block, and holds information |
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39 * about the basic block, including the successor and |
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40 * predecessor blocks, exception handlers, liveness information, etc. |
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41 */ |
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42 public final class BlockBegin extends StateSplit { |
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43 |
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44 private static final int INPUT_COUNT = 1; |
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45 private static final int INPUT_STATE_BEFORE = 0; |
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46 |
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47 private static final int SUCCESSOR_COUNT = 1; |
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48 private static final int SUCCESSOR_END = 0; |
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49 |
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50 @Override |
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51 protected int inputCount() { |
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52 return super.inputCount() + INPUT_COUNT; |
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53 } |
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54 |
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55 @Override |
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56 protected int successorCount() { |
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57 return super.successorCount() + SUCCESSOR_COUNT; |
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58 } |
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59 |
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60 /** |
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61 * The last node in the block (which contains the successors). |
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62 */ |
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63 public BlockEnd end() { |
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64 return (BlockEnd) successors().get(super.successorCount() + SUCCESSOR_END); |
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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 public void setEnd(BlockEnd end) { |
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73 assert end != null; |
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74 successors().set(super.successorCount() + SUCCESSOR_END, end); |
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75 } |
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76 |
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77 /** |
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78 * A unique id used in tracing. |
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79 */ |
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80 public final int blockID; |
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81 |
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82 private int depthFirstNumber; |
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83 private int linearScanNumber; |
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84 |
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85 // LIR block |
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86 private LIRBlock lirBlock; |
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87 |
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88 public void setLIRBlock(LIRBlock block) { |
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89 this.lirBlock = block; |
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90 } |
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91 |
2726 | 92 public LIRBlock lirBlock() { |
93 return lirBlock; | |
94 } | |
95 | |
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96 /** |
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97 * Index of bytecode that generated this node when appended in a basic block. |
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98 * Negative values indicate special cases. |
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99 */ |
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100 private int bci; |
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101 |
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102 /** |
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103 * Constructs a new BlockBegin at the specified bytecode index. |
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104 * @param bci the bytecode index of the start |
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105 * @param blockID the ID of the block |
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106 * @param graph |
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107 */ |
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108 public BlockBegin(int bci, int blockID, Graph graph) { |
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109 super(CiKind.Illegal, INPUT_COUNT, SUCCESSOR_COUNT, graph); |
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110 this.blockID = blockID; |
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111 depthFirstNumber = -1; |
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112 linearScanNumber = -1; |
2727 | 113 this.bci = bci; |
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114 } |
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115 |
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116 /** |
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117 * Gets the list of predecessors of this block. |
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118 * @return the predecessor list |
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119 */ |
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120 @SuppressWarnings({ "unchecked", "rawtypes" }) |
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121 public List<Instruction> blockPredecessors() { |
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122 if (predecessors().size() == 1 && predecessors().get(0) == graph().root()) { |
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123 return Collections.EMPTY_LIST; |
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124 } else { |
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125 return (List) Collections.unmodifiableList(predecessors()); |
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126 } |
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127 } |
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128 |
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129 /** |
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130 * Gets the depth first traversal number of this block. |
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131 * @return the depth first number |
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132 */ |
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133 public int depthFirstNumber() { |
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134 return depthFirstNumber; |
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135 } |
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136 |
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137 /** |
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138 * Gets the linear scan number of this block. |
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139 * @return the linear scan number |
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140 */ |
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141 public int linearScanNumber() { |
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142 return linearScanNumber; |
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143 } |
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144 |
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145 public void setDepthFirstNumber(int depthFirstNumber) { |
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146 assert depthFirstNumber >= 0; |
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147 this.depthFirstNumber = depthFirstNumber; |
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148 } |
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149 |
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150 public void setLinearScanNumber(int linearScanNumber) { |
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151 this.linearScanNumber = linearScanNumber; |
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152 } |
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153 |
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154 /** |
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155 * Iterate over this block, its exception handlers, and its successors, in that order. |
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156 * @param closure the closure to apply to each block |
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157 */ |
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158 public void iteratePreOrder(BlockClosure closure) { |
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159 // XXX: identity hash map might be too slow, consider a boolean array or a mark field |
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160 iterate(new IdentityHashMap<BlockBegin, BlockBegin>(), closure); |
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161 } |
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162 |
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163 /** |
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164 * Iterate over all blocks transitively reachable from this block. |
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165 * @param closure the closure to apply to each block |
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166 * @param predecessors {@code true} if also to include this blocks predecessors |
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167 */ |
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168 public void iterateAnyOrder(BlockClosure closure, boolean predecessors) { |
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169 IdentityHashMap<BlockBegin, BlockBegin> mark = new IdentityHashMap<BlockBegin, BlockBegin>(); |
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170 LinkedList<BlockBegin> queue = new LinkedList<BlockBegin>(); |
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171 queue.offer(this); |
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172 mark.put(this, this); |
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173 BlockBegin block; |
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174 while ((block = queue.poll()) != null) { |
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175 closure.apply(block); |
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176 |
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177 Instruction inst = block; |
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178 ArrayList<BlockBegin> excBlocks = new ArrayList<BlockBegin>(); |
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179 while (inst != null) { |
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180 if (inst instanceof ExceptionEdgeInstruction) { |
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181 excBlocks.add(((ExceptionEdgeInstruction) inst).exceptionEdge()); |
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182 } |
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183 inst = inst.next(); |
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184 } |
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185 while (excBlocks.remove(null)) { |
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186 // nothing |
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187 } |
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188 if (excBlocks.size() > 0) { |
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189 queueBlocks(queue, excBlocks, mark); |
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190 } |
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191 |
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192 queueBlocks(queue, block.end().blockSuccessors(), mark); |
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193 if (predecessors) { |
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194 queueBlockEnds(queue, block.blockPredecessors(), mark); |
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195 } |
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196 } |
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197 } |
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198 |
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199 private void queueBlocks(LinkedList<BlockBegin> queue, List<BlockBegin> list, IdentityHashMap<BlockBegin, BlockBegin> mark) { |
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200 if (list != null) { |
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201 for (BlockBegin b : list) { |
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202 if (!mark.containsKey(b)) { |
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203 queue.offer(b); |
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204 mark.put(b, b); |
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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 |
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210 private void queueBlockEnds(LinkedList<BlockBegin> queue, List<Instruction> list, IdentityHashMap<BlockBegin, BlockBegin> mark) { |
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211 if (list != null) { |
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212 for (Instruction end : list) { |
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213 BlockBegin b = end.block(); |
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214 if (!mark.containsKey(b)) { |
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215 queue.offer(b); |
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216 mark.put(b, b); |
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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 /** |
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223 * Gets the bytecode index of this instruction. |
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224 * @return the bytecode index of this instruction |
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225 */ |
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226 public int bci() { |
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227 return bci; |
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228 } |
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229 |
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230 private void iterate(IdentityHashMap<BlockBegin, BlockBegin> mark, BlockClosure closure) { |
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231 if (!mark.containsKey(this)) { |
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232 mark.put(this, this); |
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233 closure.apply(this); |
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234 BlockEnd e = end(); |
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235 |
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236 Instruction inst = this; |
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237 ArrayList<BlockBegin> excBlocks = new ArrayList<BlockBegin>(); |
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238 while (inst != null) { |
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239 if (inst instanceof Invoke) { |
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240 excBlocks.add(((Invoke) inst).exceptionEdge()); |
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241 } else if (inst instanceof Throw) { |
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242 excBlocks.add(((Throw) inst).exceptionEdge()); |
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243 } |
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244 inst = inst.next(); |
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245 } |
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246 while (excBlocks.remove(null)) { |
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247 // nothing |
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248 } |
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249 if (excBlocks.size() > 0) { |
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250 iterateReverse(mark, closure, excBlocks); |
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251 } |
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252 |
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253 assert e != null : "block must have block end"; |
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254 iterateReverse(mark, closure, e.blockSuccessors()); |
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255 } |
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256 } |
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257 |
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258 private void iterateReverse(IdentityHashMap<BlockBegin, BlockBegin> mark, BlockClosure closure, List<BlockBegin> list) { |
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259 for (int i = list.size() - 1; i >= 0; i--) { |
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260 list.get(i).iterate(mark, closure); |
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261 } |
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262 } |
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263 |
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264 @Override |
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265 public void accept(ValueVisitor v) { |
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266 v.visitBlockBegin(this); |
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267 } |
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268 |
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269 public void mergeOrClone(FrameStateAccess newState, RiMethod method) { |
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270 FrameState existingState = stateBefore(); |
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271 |
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272 if (existingState == null) { |
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273 // copy state because it is modified |
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274 FrameState duplicate = newState.duplicate(bci()); |
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275 |
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276 if (C1XOptions.UseStackMapTableLiveness && method != null) { |
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277 // if a liveness map is available, use it to invalidate dead locals |
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278 CiBitMap[] livenessMap = method.livenessMap(); |
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279 if (livenessMap != null && bci() >= 0) { |
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280 assert bci() < livenessMap.length; |
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281 CiBitMap liveness = livenessMap[bci()]; |
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282 if (liveness != null) { |
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283 invalidateDeadLocals(duplicate, liveness); |
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284 } |
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285 } |
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286 } |
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287 |
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288 // if the block is a loop header, insert all necessary phis |
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289 if (isParserLoopHeader()) { |
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290 insertLoopPhis(duplicate); |
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291 } |
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292 |
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293 setStateBefore(duplicate); |
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294 } else { |
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295 if (!C1XOptions.AssumeVerifiedBytecode && !existingState.isCompatibleWith(newState)) { |
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296 // stacks or locks do not match--bytecodes would not verify |
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297 throw new CiBailout("stack or locks do not match"); |
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298 } |
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299 |
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300 assert existingState.localsSize() == newState.localsSize(); |
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301 assert existingState.stackSize() == newState.stackSize(); |
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302 |
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303 existingState.merge(this, newState); |
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304 } |
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305 } |
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306 |
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307 private void invalidateDeadLocals(FrameState newState, CiBitMap liveness) { |
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308 int max = newState.localsSize(); |
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309 assert max <= liveness.size(); |
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310 for (int i = 0; i < max; i++) { |
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311 Value x = newState.localAt(i); |
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312 if (x != null) { |
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313 if (!liveness.get(i)) { |
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314 // invalidate the local if it is not live |
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315 newState.invalidateLocal(i); |
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316 } |
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317 } |
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318 } |
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319 } |
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320 |
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321 private void insertLoopPhis(FrameState newState) { |
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322 int stackSize = newState.stackSize(); |
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323 for (int i = 0; i < stackSize; i++) { |
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324 // always insert phis for the stack |
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325 newState.setupPhiForStack(this, i); |
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326 } |
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327 int localsSize = newState.localsSize(); |
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328 for (int i = 0; i < localsSize; i++) { |
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329 Value x = newState.localAt(i); |
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330 if (x != null) { |
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331 newState.setupPhiForLocal(this, i); |
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332 } |
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333 } |
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334 } |
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335 |
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336 boolean parserLoopHeader; |
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337 |
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338 public boolean isParserLoopHeader() { |
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339 return parserLoopHeader; |
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340 } |
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341 |
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342 public void setParserLoopHeader(boolean value) { |
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343 parserLoopHeader = value; |
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344 } |
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345 |
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346 @Override |
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347 public String toString() { |
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348 StringBuilder builder = new StringBuilder(); |
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349 builder.append("block #"); |
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350 builder.append(blockID); |
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351 builder.append(","); |
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352 builder.append(depthFirstNumber); |
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353 builder.append(" ["); |
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354 |
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355 builder.append("]"); |
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356 if (end() != null) { |
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357 builder.append(" -> "); |
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358 boolean hasSucc = false; |
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359 for (BlockBegin s : end().blockSuccessors()) { |
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360 if (hasSucc) { |
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361 builder.append(", "); |
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362 } |
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363 builder.append("#"); |
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364 builder.append(s.blockID); |
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365 hasSucc = true; |
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366 } |
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367 } |
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368 return builder.toString(); |
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369 } |
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370 |
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371 /** |
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372 * Get the number of successors. |
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373 * @return the number of successors |
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374 */ |
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375 public int numberOfSux() { |
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376 return end().blockSuccessorCount(); |
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377 } |
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378 |
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379 /** |
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380 * Get the successor at a certain position. |
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381 * @param i the position |
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382 * @return the successor |
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383 */ |
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384 public BlockBegin suxAt(int i) { |
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385 return end().blockSuccessor(i); |
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386 } |
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387 |
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388 /** |
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389 * Get the number of predecessors. |
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390 * @return the number of predecessors |
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391 */ |
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392 public int numberOfPreds() { |
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393 // ignore the graph root |
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394 if (predecessors().size() == 1 && predecessors().get(0) == graph().root()) { |
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395 return 0; |
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396 } else { |
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397 return predecessors().size(); |
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398 } |
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399 } |
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400 |
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401 public Instruction predAt(int j) { |
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402 return (Instruction) predecessors().get(j); |
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403 } |
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404 |
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405 public void printWithoutPhis(LogStream out) { |
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406 // print block id |
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407 BlockEnd end = end(); |
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408 out.print("B").print(blockID).print(" "); |
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409 |
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410 // print flags |
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411 StringBuilder sb = new StringBuilder(8); |
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412 if (isParserLoopHeader()) { |
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413 sb.append("LH"); |
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414 } |
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415 if (sb.length() != 0) { |
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416 out.print('(').print(sb.toString()).print(')'); |
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417 } |
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418 |
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419 // print block bci range |
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420 out.print('[').print(-1).print(", ").print(-1).print(']'); |
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421 |
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422 // print block successors |
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423 if (end != null && end.blockSuccessors().size() > 0) { |
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424 out.print(" ."); |
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425 for (BlockBegin successor : end.blockSuccessors()) { |
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426 out.print(" B").print(successor.blockID); |
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427 } |
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428 } |
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429 |
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430 // print predecessors |
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431 if (!blockPredecessors().isEmpty()) { |
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432 out.print(" pred:"); |
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433 for (Instruction pred : blockPredecessors()) { |
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434 out.print(" B").print(pred.block().blockID); |
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435 } |
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436 } |
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437 } |
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438 |
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439 @Override |
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440 public void print(LogStream out) { |
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441 |
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442 printWithoutPhis(out); |
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443 |
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444 // print phi functions |
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445 boolean hasPhisInLocals = false; |
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446 boolean hasPhisOnStack = false; |
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447 |
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448 if (end() != null && end().stateAfter() != null) { |
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449 FrameState state = stateBefore(); |
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450 |
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451 int i = 0; |
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452 while (!hasPhisOnStack && i < state.stackSize()) { |
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453 Value value = state.stackAt(i); |
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454 hasPhisOnStack = isPhiAtBlock(value); |
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455 if (value != null && !value.isIllegal()) { |
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456 i += value.kind.sizeInSlots(); |
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457 } else { |
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458 i++; |
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459 } |
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460 } |
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461 |
2564
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462 for (i = 0; !hasPhisInLocals && i < state.localsSize();) { |
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463 Value value = state.localAt(i); |
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464 hasPhisInLocals = isPhiAtBlock(value); |
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465 // also ignore illegal HiWords |
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466 if (value != null && !value.isIllegal()) { |
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467 i += value.kind.sizeInSlots(); |
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468 } else { |
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469 i++; |
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470 } |
2564
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471 } |
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472 } |
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473 |
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474 // print values in locals |
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475 if (hasPhisInLocals) { |
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476 out.println(); |
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477 out.println("Locals:"); |
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|
478 |
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479 FrameState state = stateBefore(); |
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480 int i = 0; |
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481 while (i < state.localsSize()) { |
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482 Value value = state.localAt(i); |
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483 if (value != null) { |
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484 out.println(stateString(i, value)); |
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485 // also ignore illegal HiWords |
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486 i += value.isIllegal() ? 1 : value.kind.sizeInSlots(); |
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487 } else { |
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488 i++; |
2507
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489 } |
2564
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490 } |
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491 out.println(); |
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492 } |
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|
493 |
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494 // print values on stack |
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495 if (hasPhisOnStack) { |
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496 out.println(); |
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497 out.println("Stack:"); |
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498 int i = 0; |
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499 while (i < stateBefore().stackSize()) { |
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500 Value value = stateBefore().stackAt(i); |
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501 if (value != null) { |
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502 out.println(stateString(i, value)); |
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503 i += value.kind.sizeInSlots(); |
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504 } else { |
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505 i++; |
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506 } |
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507 } |
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508 } |
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509 |
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510 } |
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511 |
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512 /** |
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513 * Determines if a given instruction is a phi whose {@linkplain Phi#block() join block} is a given block. |
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514 * |
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515 * @param value the instruction to test |
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516 * @param block the block that may be the join block of {@code value} if {@code value} is a phi |
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517 * @return {@code true} if {@code value} is a phi and its join block is {@code block} |
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518 */ |
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519 private boolean isPhiAtBlock(Value value) { |
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520 return value instanceof Phi && ((Phi) value).block() == this; |
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521 } |
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522 |
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523 |
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524 /** |
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525 * 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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526 * block, its {@linkplain Phi#phiInputCount() inputs} are appended to the returned string. |
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527 * |
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528 * @param index the index of the value in the frame state |
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529 * @param value the frame state value |
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530 * @param block if {@code value} is a phi, then its inputs are formatted if {@code block} is its |
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531 * {@linkplain Phi#block() join point} |
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532 * @return the instruction representation as a string |
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533 */ |
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534 public String stateString(int index, Value value) { |
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535 StringBuilder sb = new StringBuilder(30); |
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536 sb.append(String.format("%2d %s", index, Util.valueString(value))); |
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537 if (value instanceof Phi) { |
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538 Phi phi = (Phi) value; |
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539 // print phi operands |
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540 if (phi.block() == this) { |
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541 sb.append(" ["); |
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542 for (int j = 0; j < phi.phiInputCount(); j++) { |
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543 sb.append(' '); |
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544 Value operand = phi.inputAt(j); |
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545 if (operand != null) { |
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546 sb.append(Util.valueString(operand)); |
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547 } else { |
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548 sb.append("NULL"); |
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549 } |
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550 } |
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551 sb.append("] "); |
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552 } |
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553 } |
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554 if (value != null && value.hasSubst()) { |
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555 sb.append("alias ").append(Util.valueString(value.subst())); |
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556 } |
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557 return sb.toString(); |
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558 } |
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559 |
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560 @Override |
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561 public String shortName() { |
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562 return "BlockBegin #" + blockID; |
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563 } |
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564 |
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565 /** |
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566 * Iterates over all successors of this block: successors of the end node and exception handler. |
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567 */ |
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568 public void allSuccessorsDo(boolean backwards, BlockClosure closure) { |
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569 if (backwards) { |
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570 for (int i = numberOfSux() - 1; i >= 0; i--) { |
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571 closure.apply(suxAt(i)); |
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572 } |
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573 } else { |
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574 for (int i = 0; i < numberOfSux(); i++) { |
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575 closure.apply(suxAt(i)); |
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|
576 } |
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|
577 } |
7ed72769d51a
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|
578 for (Instruction x = next(); x != null; x = x.next()) { |
2715
3ac3dd97d8df
Added ExceptionEdgeInstruction interface.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
2708
diff
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579 if (x instanceof ExceptionEdgeInstruction && ((ExceptionEdgeInstruction) x).exceptionEdge() != null) { |
3ac3dd97d8df
Added ExceptionEdgeInstruction interface.
Thomas Wuerthinger <thomas@wuerthinger.net>
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diff
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|
580 closure.apply(((ExceptionEdgeInstruction) x).exceptionEdge()); |
2707
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exception handling related changes:
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parents:
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diff
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|
581 } |
7ed72769d51a
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parents:
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changeset
|
582 } |
7ed72769d51a
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Lukas Stadler <lukas.stadler@jku.at>
parents:
2677
diff
changeset
|
583 } |
2507
9ec15d6914ca
Pull over of compiler from maxine repository.
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parents:
diff
changeset
|
584 } |