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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/lir/cfg/Block.java @ 6411:c5afcc2ebd3d

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change of project structure: separate compiler and LIR, put EA into separate project
author Lukas Stadler <lukas.stadler@jku.at>
date Mon, 17 Sep 2012 16:08:46 +0200
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6411
c5afcc2ebd3d change of project structure: separate compiler and LIR, put EA into separate project
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1 /*
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2 * Copyright (c) 2009, 2012, 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.oracle.graal.lir.cfg;
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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.nodes.*;
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28 import com.oracle.graal.nodes.java.*;
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29
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30 public class Block {
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31
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32 protected int id;
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33
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34 protected BeginNode beginNode;
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35 protected FixedNode endNode;
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36 protected Loop loop;
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37 protected double probability;
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38
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39 protected List<Block> predecessors;
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40 protected List<Block> successors;
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41
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42 protected Block dominator;
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43 protected List<Block> dominated;
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44 protected Block postdominator;
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45
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46 // Fields that still need to be worked on, try to remove them later.
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47 public boolean align;
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48 public int linearScanNumber;
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49
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50 protected Block() {
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51 id = ControlFlowGraph.BLOCK_ID_INITIAL;
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52 }
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53
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54 public int getId() {
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55 return id;
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56 }
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57
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58 public BeginNode getBeginNode() {
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59 return beginNode;
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60 }
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61
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62 public FixedNode getEndNode() {
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63 return endNode;
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64 }
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65
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66 public Loop getLoop() {
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67 return loop;
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68 }
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69
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70 public int getLoopDepth() {
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71 return loop == null ? 0 : loop.depth;
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72 }
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73
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74 public boolean isLoopHeader() {
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75 return getBeginNode() instanceof LoopBeginNode;
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76 }
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77
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78 public boolean isLoopEnd() {
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79 return getEndNode() instanceof LoopEndNode;
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80 }
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81
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82 public boolean isExceptionEntry() {
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83 return getBeginNode().next() instanceof ExceptionObjectNode;
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84 }
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85
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86 public List<Block> getPredecessors() {
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87 return predecessors;
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88 }
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89
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90 public List<Block> getSuccessors() {
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91 return successors;
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92 }
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93
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94 public Block getDominator() {
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95 return dominator;
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96 }
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97
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98 public Block getEarliestPostDominated() {
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99 Block b = this;
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100 while (true) {
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101 Block dom = b.getDominator();
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102 if (dom != null && dom.getPostdominator() == b) {
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103 b = dom;
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104 } else {
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105 break;
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106 }
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107 }
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108 return b;
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109 }
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110
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111 public List<Block> getDominated() {
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112 if (dominated == null) {
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113 return Collections.emptyList();
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114 }
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115 return dominated;
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116 }
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117
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118 public Block getPostdominator() {
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119 return postdominator;
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120 }
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121
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122 private class NodeIterator implements Iterator<FixedNode> {
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123 private FixedNode cur;
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124
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125 public NodeIterator() {
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126 cur = getBeginNode();
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127 }
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128
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129 @Override
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130 public boolean hasNext() {
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131 return cur != null;
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132 }
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133
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134 @Override
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135 public FixedNode next() {
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136 FixedNode result = cur;
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137 if (cur == getEndNode()) {
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138 cur = null;
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139 } else {
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140 cur = ((FixedWithNextNode) cur).next();
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141 }
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142 assert !(cur instanceof BeginNode);
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143 return result;
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144 }
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145
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146 @Override
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147 public void remove() {
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148 throw new UnsupportedOperationException();
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149 }
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150 }
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151
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152 public Iterable<FixedNode> getNodes() {
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153 return new Iterable<FixedNode>() {
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154 @Override
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155 public Iterator<FixedNode> iterator() {
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156 return new NodeIterator();
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157 }
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158
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159 @Override
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160 public String toString() {
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161 StringBuilder str = new StringBuilder().append('[');
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162 for (FixedNode node : this) {
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163 str.append(node).append(", ");
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164 }
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165 if (str.length() > 1) {
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166 str.setLength(str.length() - 2);
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167 }
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168 return str.append(']').toString();
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169 }
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170 };
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171 }
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172
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173 @Override
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174 public String toString() {
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175 return "B" + id;
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176 }
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177
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178
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179 // to be inlined later on
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180 public int numberOfPreds() {
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181 return getPredecessors().size();
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182 }
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183
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184 public int numberOfSux() {
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185 return getSuccessors().size();
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186 }
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187
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188 public Block predAt(int i) {
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189 return getPredecessors().get(i);
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190 }
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191
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192 public Block suxAt(int i) {
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193 return getSuccessors().get(i);
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194 }
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195 // end to be inlined later on
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196
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197 public boolean dominates(Block block) {
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198 return block.isDominatedBy(this);
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199 }
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200
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201 public boolean isDominatedBy(Block block) {
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202 if (block == this) {
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203 return true;
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204 }
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205 if (dominator == null) {
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206 return false;
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207 }
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208 return dominator.isDominatedBy(block);
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209 }
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210 }