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annotate graal/GraalCompiler/src/com/sun/c1x/ir/BlockEnd.java @ 2788:df4c5254c5cc

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Towards goto removal.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 25 May 2011 14:33:44 +0200
parents 915456e4959e
children 50677668afe3
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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 = 0;
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39 private final int blockSuccessorCount;
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40
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41 @Override
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42 protected int inputCount() {
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43 return super.inputCount() + INPUT_COUNT;
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44 }
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45
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46 @Override
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47 protected int successorCount() {
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48 return super.successorCount() + blockSuccessorCount + SUCCESSOR_COUNT;
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49 }
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50
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51 /**
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52 * The list of instructions that produce input for this instruction.
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53 */
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54 public Instruction blockSuccessor(int index) {
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55 assert index >= 0 && index < blockSuccessorCount;
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56 return (Instruction) successors().get(super.successorCount() + SUCCESSOR_COUNT + index);
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57 }
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58
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59 public Instruction setBlockSuccessor(int index, Instruction n) {
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60 assert index >= 0 && index < blockSuccessorCount;
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61 // assert n == null || n instanceof BlockBegin : "only BlockBegins, for now... " + n.getClass();
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62 return (BlockBegin) successors().set(super.successorCount() + SUCCESSOR_COUNT + index, n);
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63 }
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64
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65 public int blockSuccessorCount() {
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66 return blockSuccessorCount;
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67 }
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68
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69 /**
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70 * Constructs a new block end with the specified value type.
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71 * @param kind the type of the value produced by this instruction
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72 * @param successors the list of successor blocks. If {@code null}, a new one will be created.
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73 */
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74 public BlockEnd(CiKind kind, List<? extends Instruction> blockSuccessors, int inputCount, int successorCount, Graph graph) {
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75 this(kind, blockSuccessors.size(), inputCount, successorCount, graph);
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76 for (int i = 0; i < blockSuccessors.size(); i++) {
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77 setBlockSuccessor(i, blockSuccessors.get(i));
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78 }
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79 }
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80
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81 public BlockEnd(CiKind kind, int blockSuccessorCount, int inputCount, int successorCount, Graph graph) {
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82 super(kind, inputCount + INPUT_COUNT, successorCount + blockSuccessorCount + SUCCESSOR_COUNT, graph);
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83 this.blockSuccessorCount = blockSuccessorCount;
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84 }
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85
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86 public BlockEnd(CiKind kind, Graph graph) {
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87 this(kind, 2, 0, 0, graph);
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88 }
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89
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90 /**
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91 * Gets the block begin associated with this block end.
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92 * @return the beginning of this basic block
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93 */
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94 public BlockBegin begin() {
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95 for (Node n : predecessors()) {
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96 if (n instanceof BlockBegin) {
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97 return (BlockBegin) n;
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98 }
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99 }
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100 return null;
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101 }
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102
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103 /**
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104 * Substitutes a successor block in this block end's successor list. Note that
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105 * this method updates all occurrences in the list.
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106 * @param oldSucc the old successor to replace
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107 * @param newSucc the new successor
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108 */
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109 public int substituteSuccessor(BlockBegin oldSucc, BlockBegin newSucc) {
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110 assert newSucc != null;
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111 int count = 0;
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112 for (int i = 0; i < blockSuccessorCount; i++) {
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113 if (blockSuccessor(i) == oldSucc) {
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114 setBlockSuccessor(i, newSucc);
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115 count++;
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116 }
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117 }
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118 return count;
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119 }
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120
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121 /**
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122 * Gets the successor corresponding to the default (fall through) case.
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123 * @return the default successor
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124 */
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125 public Instruction defaultSuccessor() {
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126 return blockSuccessor(blockSuccessorCount - 1);
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127 }
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128
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129 /**
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130 * Searches for the specified successor and returns its index into the
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131 * successor list if found.
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132 * @param b the block to search for in the successor list
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133 * @return the index of the block in the list if found; <code>-1</code> otherwise
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134 */
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135 public int successorIndex(BlockBegin b) {
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136 for (int i = 0; i < blockSuccessorCount; i++) {
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137 if (blockSuccessor(i) == b) {
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138 return i;
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139 }
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140 }
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141 return -1;
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142 }
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143
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144 /**
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145 * 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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146 */
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147 public void reorderSuccessor(int i, int backEdgeIndex) {
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148 assert i >= 0 && i < blockSuccessorCount;
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149 Instruction successor = blockSuccessor(i);
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150 if (successor != null) {
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151 successors().set(super.successorCount() + SUCCESSOR_COUNT + i, Node.Null);
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152 successors().set(super.successorCount() + SUCCESSOR_COUNT + i, successor, backEdgeIndex);
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153 }
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154 }
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155
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156 /**
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157 * Gets this block end's list of successors.
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158 * @return the successor list
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159 */
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160 @SuppressWarnings({ "unchecked", "rawtypes"})
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161 public List<BlockBegin> blockSuccessors() {
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162 List<BlockBegin> list = (List) successors().subList(super.successorCount() + SUCCESSOR_COUNT, super.successorCount() + blockSuccessorCount + SUCCESSOR_COUNT);
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163 return Collections.unmodifiableList(list);
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164 }
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165
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166 public void clearSuccessors() {
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167 for (int i = 0; i < blockSuccessorCount(); i++) {
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168 setBlockSuccessor(i, null);
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169 }
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170 }
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171
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172 }