Mercurial > hg > graal-jvmci-8
annotate graal/GraalCompiler/src/com/sun/c1x/ir/BlockEnd.java @ 2781:bda5972a40a5
remove unnecessary BlockBegin nodes in frontend
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Tue, 24 May 2011 15:31:52 +0200 |
parents | 398b8fa5dc81 |
children | 915456e4959e |
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.cri.ci.*; |
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29 |
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30 /** |
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31 * The {@code BlockEnd} instruction is a base class for all instructions that end a basic |
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32 * block, including branches, switches, throws, and goto's. |
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33 */ |
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34 public abstract class BlockEnd extends Instruction { |
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35 |
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36 private static final int INPUT_COUNT = 0; |
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37 |
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38 private static final int SUCCESSOR_COUNT = 1; |
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39 private static final int SUCCESSOR_STATE_AFTER = 0; |
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40 private final int blockSuccessorCount; |
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41 |
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42 @Override |
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43 protected int inputCount() { |
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44 return super.inputCount() + INPUT_COUNT; |
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45 } |
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46 |
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47 @Override |
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48 protected int successorCount() { |
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49 return super.successorCount() + blockSuccessorCount + SUCCESSOR_COUNT; |
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50 } |
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51 |
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52 /** |
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53 * The list of instructions that produce input for this instruction. |
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54 */ |
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55 public BlockBegin blockSuccessor(int index) { |
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56 assert index >= 0 && index < blockSuccessorCount; |
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57 return (BlockBegin) successors().get(super.successorCount() + SUCCESSOR_COUNT + index); |
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58 } |
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59 |
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60 public Instruction setBlockSuccessor(int index, Instruction n) { |
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61 assert index >= 0 && index < blockSuccessorCount; |
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62 // assert n == null || n instanceof BlockBegin : "only BlockBegins, for now... " + n.getClass(); |
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63 return (BlockBegin) successors().set(super.successorCount() + SUCCESSOR_COUNT + index, n); |
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64 } |
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65 |
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66 public int blockSuccessorCount() { |
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67 return blockSuccessorCount; |
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68 } |
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69 |
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70 /** |
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71 * Constructs a new block end with the specified value type. |
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72 * @param kind the type of the value produced by this instruction |
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73 * @param successors the list of successor blocks. If {@code null}, a new one will be created. |
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74 */ |
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75 public BlockEnd(CiKind kind, List<? extends Instruction> blockSuccessors, int inputCount, int successorCount, Graph graph) { |
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76 this(kind, blockSuccessors.size(), inputCount, successorCount, graph); |
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77 for (int i = 0; i < blockSuccessors.size(); i++) { |
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78 setBlockSuccessor(i, blockSuccessors.get(i)); |
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79 } |
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80 } |
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81 |
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82 public BlockEnd(CiKind kind, int blockSuccessorCount, int inputCount, int successorCount, Graph graph) { |
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83 super(kind, inputCount + INPUT_COUNT, successorCount + blockSuccessorCount + SUCCESSOR_COUNT, graph); |
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84 this.blockSuccessorCount = blockSuccessorCount; |
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85 } |
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86 |
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87 public BlockEnd(CiKind kind, Graph graph) { |
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88 this(kind, 2, 0, 0, graph); |
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89 } |
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90 |
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91 /** |
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92 * Gets the block begin associated with this block end. |
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93 * @return the beginning of this basic block |
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94 */ |
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95 public BlockBegin begin() { |
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96 for (Node n : predecessors()) { |
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97 if (n instanceof BlockBegin) { |
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98 return (BlockBegin) n; |
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99 } |
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100 } |
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101 return null; |
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102 } |
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103 |
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104 /** |
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105 * Substitutes a successor block in this block end's successor list. Note that |
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106 * this method updates all occurrences in the list. |
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107 * @param oldSucc the old successor to replace |
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108 * @param newSucc the new successor |
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109 */ |
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110 public int substituteSuccessor(BlockBegin oldSucc, BlockBegin newSucc) { |
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111 assert newSucc != null; |
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112 int count = 0; |
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113 for (int i = 0; i < blockSuccessorCount; i++) { |
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114 if (blockSuccessor(i) == oldSucc) { |
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115 setBlockSuccessor(i, newSucc); |
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116 count++; |
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117 } |
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118 } |
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119 return count; |
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120 } |
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121 |
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122 /** |
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123 * Gets the successor corresponding to the default (fall through) case. |
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124 * @return the default successor |
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125 */ |
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126 public BlockBegin defaultSuccessor() { |
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127 return blockSuccessor(blockSuccessorCount - 1); |
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128 } |
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129 |
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130 /** |
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131 * Searches for the specified successor and returns its index into the |
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132 * successor list if found. |
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133 * @param b the block to search for in the successor list |
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134 * @return the index of the block in the list if found; <code>-1</code> otherwise |
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135 */ |
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136 public int successorIndex(BlockBegin b) { |
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137 for (int i = 0; i < blockSuccessorCount; i++) { |
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138 if (blockSuccessor(i) == b) { |
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139 return i; |
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140 } |
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141 } |
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142 return -1; |
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143 } |
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144 |
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145 /** |
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146 * 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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147 */ |
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148 public void reorderSuccessor(int i, int backEdgeIndex) { |
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149 assert i >= 0 && i < blockSuccessorCount; |
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150 Instruction successor = blockSuccessor(i); |
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151 if (successor != null) { |
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152 successors().set(super.successorCount() + SUCCESSOR_COUNT + i, Node.Null); |
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153 successors().set(super.successorCount() + SUCCESSOR_COUNT + i, successor, backEdgeIndex); |
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154 } |
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155 } |
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156 |
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157 /** |
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158 * Gets this block end's list of successors. |
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159 * @return the successor list |
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160 */ |
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161 @SuppressWarnings({ "unchecked", "rawtypes"}) |
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162 public List<BlockBegin> blockSuccessors() { |
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163 List<BlockBegin> list = (List) successors().subList(super.successorCount() + SUCCESSOR_COUNT, super.successorCount() + blockSuccessorCount + SUCCESSOR_COUNT); |
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164 return Collections.unmodifiableList(list); |
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165 } |
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166 |
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167 public void clearSuccessors() { |
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168 for (int i = 0; i < blockSuccessorCount(); i++) { |
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169 setBlockSuccessor(i, null); |
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170 } |
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171 } |
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172 |
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173 } |