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annotate graal/GraalCompiler/src/com/sun/c1x/ir/BlockEnd.java @ 2602:0c6564c254af

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new node layout: BlockBegin, BlockEnd -Dc1x.dot=regex for pdf output escape dot graph labels (<, >, &)
author Lukas Stadler <lukas.stadler@jku.at>
date Fri, 06 May 2011 10:25:37 +0200
parents 4a36a0bd6d18
children 3558ca7088c0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 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;
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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 BlockBegin blockSuccessor(int index) {
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55 assert index >= 0 && index < blockSuccessorCount;
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56 return (BlockBegin) successors().get(super.successorCount() + index);
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57 }
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58
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59 public BlockBegin setBlockSuccessor(int index, BlockBegin n) {
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60 assert index >= 0 && index < blockSuccessorCount;
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61 return (BlockBegin) successors().set(super.successorCount() + index, n);
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62 }
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63
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64 public int blockSuccessorCount() {
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65 return blockSuccessorCount;
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66 }
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67
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68 BlockBegin begin;
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69 FrameState stateAfter;
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70 boolean isSafepoint;
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71
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72 /**
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73 * Constructs a new block end with the specified value type.
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74 * @param kind the type of the value produced by this instruction
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75 * @param stateAfter the frame state at the end of this block
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76 * @param isSafepoint {@code true} if this instruction is a safepoint instruction
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77 * @param successors the list of successor blocks. If {@code null}, a new one will be created.
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78 */
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79 public BlockEnd(CiKind kind, FrameState stateAfter, boolean isSafepoint, List<BlockBegin> blockSuccessors, int inputCount, int successorCount, Graph graph) {
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80 this(kind, stateAfter, isSafepoint, blockSuccessors.size(), inputCount, successorCount, graph);
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81 for (int i = 0; i < blockSuccessors.size(); i++) {
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82 setBlockSuccessor(i, blockSuccessors.get(i));
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83 }
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84 }
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85
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86 public BlockEnd(CiKind kind, FrameState stateAfter, boolean isSafepoint, int blockSuccessorCount, int inputCount, int successorCount, Graph graph) {
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87 super(kind, inputCount + INPUT_COUNT, successorCount + blockSuccessorCount, graph);
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88 this.blockSuccessorCount = blockSuccessorCount;
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89 setStateAfter(stateAfter);
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90 this.isSafepoint = isSafepoint;
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91 }
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92
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93 public BlockEnd(CiKind kind, FrameState stateAfter, boolean isSafepoint, Graph graph) {
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94 this(kind, stateAfter, isSafepoint, 2, 0, 0, graph);
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95 }
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96
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97 /**
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98 * Gets the state after the end of this block.
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99 */
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100 @Override
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101 public FrameState stateAfter() {
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102 return stateAfter;
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103 }
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104
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105 public void setStateAfter(FrameState state) {
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106 stateAfter = state;
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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 return begin;
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123 }
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124
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125 /**
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126 * Sets the basic block beginning for this block end. This should only
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127 * be called from {@link BlockBegin}.
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128 *
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129 * @param block the beginning of this basic block
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130 */
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131 void setBegin(BlockBegin block) {
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132 begin = block;
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133 }
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134
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135 /**
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136 * Substitutes a successor block in this block end's successor list. Note that
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137 * this method updates all occurrences in the list.
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138 * @param oldSucc the old successor to replace
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139 * @param newSucc the new successor
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140 */
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141 public void substituteSuccessor(BlockBegin oldSucc, BlockBegin newSucc) {
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142 assert newSucc != null;
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143 for (int i = 0; i < blockSuccessorCount; i++) {
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144 if (blockSuccessor(i) == oldSucc) {
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145 setBlockSuccessor(i, newSucc);
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146 }
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147 }
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148 }
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149
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150 /**
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151 * Gets the successor corresponding to the default (fall through) case.
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152 * @return the default successor
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153 */
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154 public BlockBegin defaultSuccessor() {
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155 return blockSuccessor(blockSuccessorCount - 1);
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156 }
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157
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158 /**
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159 * Searches for the specified successor and returns its index into the
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160 * successor list if found.
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161 * @param b the block to search for in the successor list
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162 * @return the index of the block in the list if found; <code>-1</code> otherwise
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163 */
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164 public int successorIndex(BlockBegin b) {
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165 for (int i = 0; i < blockSuccessorCount; i++) {
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166 if (blockSuccessor(i) == b) {
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167 return i;
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168 }
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169 }
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170 return -1;
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171 }
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172
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173 /**
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174 * Gets this block end's list of successors.
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175 * @return the successor list
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176 */
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177 public List<BlockBegin> blockSuccessors() {
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178 List<BlockBegin> list = (List) successors().subList(super.successorCount(), super.successorCount() + blockSuccessorCount);
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179 return Collections.unmodifiableList(list);
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180 }
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181
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182 }