Mercurial > hg > graal-compiler
annotate graal/GraalCompiler/src/com/sun/c1x/ir/BlockEnd.java @ 2704:efbdb3ea95c9
Remove critical edge split identification.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 18 May 2011 17:27:06 +0200 |
parents | 6ab73784566a |
children | 7ed72769d51a |
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.value.*; |
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29 import com.sun.cri.ci.*; |
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30 |
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31 /** |
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32 * The {@code BlockEnd} instruction is a base class for all instructions that end a basic |
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33 * block, including branches, switches, throws, and goto's. |
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34 */ |
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35 public abstract class BlockEnd extends Instruction { |
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36 |
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37 private static final int INPUT_COUNT = 0; |
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38 |
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39 private static final int SUCCESSOR_COUNT = 1; |
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40 private static final int SUCCESSOR_STATE_AFTER = 0; |
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41 private final int blockSuccessorCount; |
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42 |
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43 @Override |
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44 protected int inputCount() { |
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45 return super.inputCount() + INPUT_COUNT; |
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46 } |
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47 |
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48 @Override |
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49 protected int successorCount() { |
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50 return super.successorCount() + blockSuccessorCount + SUCCESSOR_COUNT; |
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51 } |
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52 |
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53 /** |
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54 * The state for this instruction. |
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55 */ |
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56 @Override |
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57 public FrameState stateAfter() { |
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58 return (FrameState) successors().get(super.successorCount() + SUCCESSOR_STATE_AFTER); |
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59 } |
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60 |
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61 public FrameState setStateAfter(FrameState n) { |
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62 return (FrameState) successors().set(super.successorCount() + SUCCESSOR_STATE_AFTER, n); |
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63 } |
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64 |
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65 /** |
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66 * The list of instructions that produce input for this instruction. |
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67 */ |
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68 public BlockBegin blockSuccessor(int index) { |
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69 assert index >= 0 && index < blockSuccessorCount; |
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70 return (BlockBegin) successors().get(super.successorCount() + SUCCESSOR_COUNT + index); |
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71 } |
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72 |
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73 public BlockBegin setBlockSuccessor(int index, BlockBegin n) { |
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74 assert index >= 0 && index < blockSuccessorCount; |
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75 return (BlockBegin) successors().set(super.successorCount() + SUCCESSOR_COUNT + index, n); |
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76 } |
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77 |
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78 public int blockSuccessorCount() { |
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79 return blockSuccessorCount; |
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80 } |
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81 |
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82 private boolean isSafepoint; |
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83 |
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84 /** |
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85 * Constructs a new block end with the specified value type. |
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86 * @param kind the type of the value produced by this instruction |
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87 * @param stateAfter the frame state at the end of this block |
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88 * @param isSafepoint {@code true} if this instruction is a safepoint instruction |
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89 * @param successors the list of successor blocks. If {@code null}, a new one will be created. |
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90 */ |
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91 public BlockEnd(CiKind kind, FrameState stateAfter, boolean isSafepoint, List<BlockBegin> blockSuccessors, int inputCount, int successorCount, Graph graph) { |
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92 this(kind, stateAfter, isSafepoint, blockSuccessors.size(), inputCount, successorCount, graph); |
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93 for (int i = 0; i < blockSuccessors.size(); i++) { |
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94 setBlockSuccessor(i, blockSuccessors.get(i)); |
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95 } |
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96 } |
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97 |
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98 public BlockEnd(CiKind kind, FrameState stateAfter, boolean isSafepoint, int blockSuccessorCount, int inputCount, int successorCount, Graph graph) { |
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99 super(kind, inputCount + INPUT_COUNT, successorCount + blockSuccessorCount + SUCCESSOR_COUNT, graph); |
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100 this.blockSuccessorCount = blockSuccessorCount; |
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101 setStateAfter(stateAfter); |
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102 this.isSafepoint = isSafepoint; |
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103 } |
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104 |
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105 public BlockEnd(CiKind kind, FrameState stateAfter, boolean isSafepoint, Graph graph) { |
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106 this(kind, stateAfter, isSafepoint, 2, 0, 0, graph); |
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107 } |
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108 |
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109 /** |
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110 * Checks whether this instruction is a safepoint. |
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111 * @return {@code true} if this instruction is a safepoint |
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112 */ |
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113 public boolean isSafepoint() { |
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114 return isSafepoint; |
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115 } |
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116 |
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117 /** |
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118 * Gets the block begin associated with this block end. |
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119 * @return the beginning of this basic block |
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120 */ |
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121 public BlockBegin begin() { |
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122 for (Node n : predecessors()) { |
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123 if (n instanceof BlockBegin) { |
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124 return (BlockBegin) n; |
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125 } |
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126 } |
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127 return null; |
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128 } |
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129 |
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130 /** |
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131 * Substitutes a successor block in this block end's successor list. Note that |
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132 * this method updates all occurrences in the list. |
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133 * @param oldSucc the old successor to replace |
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134 * @param newSucc the new successor |
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135 */ |
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136 public void substituteSuccessor(BlockBegin oldSucc, BlockBegin newSucc) { |
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137 assert newSucc != null; |
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138 for (int i = 0; i < blockSuccessorCount; i++) { |
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139 if (blockSuccessor(i) == oldSucc) { |
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140 setBlockSuccessor(i, newSucc); |
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141 } |
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142 } |
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143 } |
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144 |
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145 /** |
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146 * Gets the successor corresponding to the default (fall through) case. |
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147 * @return the default successor |
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148 */ |
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149 public BlockBegin defaultSuccessor() { |
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150 return blockSuccessor(blockSuccessorCount - 1); |
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151 } |
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152 |
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153 /** |
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154 * Searches for the specified successor and returns its index into the |
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155 * successor list if found. |
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156 * @param b the block to search for in the successor list |
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157 * @return the index of the block in the list if found; <code>-1</code> otherwise |
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158 */ |
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159 public int successorIndex(BlockBegin b) { |
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160 for (int i = 0; i < blockSuccessorCount; i++) { |
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161 if (blockSuccessor(i) == b) { |
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162 return i; |
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163 } |
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164 } |
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165 return -1; |
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166 } |
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167 |
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168 /** |
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169 * This method reorders the predecessors of the i-th successor in such a way that this BlockEnd is at position backEdgeIndex. |
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170 */ |
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171 public void reorderSuccessor(int i, int backEdgeIndex) { |
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172 assert i >= 0 && i < blockSuccessorCount; |
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173 BlockBegin successor = blockSuccessor(i); |
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174 if (successor != null) { |
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175 successors().set(super.successorCount() + SUCCESSOR_COUNT + i, Node.Null); |
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176 successors().set(super.successorCount() + SUCCESSOR_COUNT + i, successor, backEdgeIndex); |
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177 } |
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178 } |
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179 |
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180 /** |
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181 * Gets this block end's list of successors. |
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182 * @return the successor list |
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183 */ |
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184 @SuppressWarnings("unchecked") |
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185 public List<BlockBegin> blockSuccessors() { |
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186 List<BlockBegin> list = (List) successors().subList(super.successorCount() + SUCCESSOR_COUNT, super.successorCount() + blockSuccessorCount + SUCCESSOR_COUNT); |
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187 return Collections.unmodifiableList(list); |
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188 } |
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189 |
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190 } |