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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/cfg/Block.java @ 7353:b5280041f59e

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Experiment with soft alignment for branch targets.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sun, 13 Jan 2013 19:32:16 +0100
parents 2e96dc4eb8e2
children 4c6e577d0c01
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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.nodes.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 boolean softAlign;
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49 public int linearScanNumber;
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50
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51 protected Block() {
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52 id = ControlFlowGraph.BLOCK_ID_INITIAL;
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53 }
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54
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55 public int getId() {
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56 return id;
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57 }
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58
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59 public BeginNode getBeginNode() {
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60 return beginNode;
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61 }
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62
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63 public FixedNode getEndNode() {
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64 return endNode;
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65 }
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66
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67 public Loop getLoop() {
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68 return loop;
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69 }
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70
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71 public int getLoopDepth() {
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72 return loop == null ? 0 : loop.depth;
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73 }
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74
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75 public boolean isLoopHeader() {
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76 return getBeginNode() instanceof LoopBeginNode;
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77 }
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78
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79 public boolean isLoopEnd() {
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80 return getEndNode() instanceof LoopEndNode;
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81 }
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82
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83 public boolean isExceptionEntry() {
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84 return getBeginNode().next() instanceof ExceptionObjectNode;
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85 }
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86
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87 public List<Block> getPredecessors() {
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88 return predecessors;
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89 }
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90
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91 public List<Block> getSuccessors() {
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92 return successors;
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93 }
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94
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95 public Block getDominator() {
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96 return dominator;
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97 }
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98
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99 public Block getEarliestPostDominated() {
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100 Block b = this;
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101 while (true) {
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102 Block dom = b.getDominator();
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103 if (dom != null && dom.getPostdominator() == b) {
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104 b = dom;
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105 } else {
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106 break;
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107 }
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108 }
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109 return b;
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110 }
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111
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112 public List<Block> getDominated() {
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113 if (dominated == null) {
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114 return Collections.emptyList();
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115 }
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116 return dominated;
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117 }
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118
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119 public Block getPostdominator() {
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120 return postdominator;
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121 }
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122
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123 private class NodeIterator implements Iterator<FixedNode> {
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124 private FixedNode cur;
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125
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126 public NodeIterator() {
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127 cur = getBeginNode();
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128 }
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129
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130 @Override
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131 public boolean hasNext() {
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132 return cur != null;
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133 }
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134
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135 @Override
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136 public FixedNode next() {
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137 FixedNode result = cur;
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138 if (cur == getEndNode()) {
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139 cur = null;
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140 } else {
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141 cur = ((FixedWithNextNode) cur).next();
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142 }
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143 assert !(cur instanceof BeginNode);
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144 return result;
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145 }
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146
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147 @Override
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148 public void remove() {
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149 throw new UnsupportedOperationException();
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150 }
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151 }
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152
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153 public Iterable<FixedNode> getNodes() {
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154 return new Iterable<FixedNode>() {
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155 @Override
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156 public Iterator<FixedNode> iterator() {
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157 return new NodeIterator();
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158 }
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159
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160 @Override
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161 public String toString() {
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162 StringBuilder str = new StringBuilder().append('[');
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163 for (FixedNode node : this) {
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164 str.append(node).append(", ");
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165 }
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166 if (str.length() > 1) {
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167 str.setLength(str.length() - 2);
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168 }
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169 return str.append(']').toString();
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170 }
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171 };
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172 }
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173
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174 @Override
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175 public String toString() {
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176 return "B" + id;
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177 }
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178
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179
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180 // to be inlined later on
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181 public int numberOfPreds() {
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182 return getPredecessors().size();
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183 }
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184
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185 public int numberOfSux() {
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186 return getSuccessors().size();
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187 }
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188
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189 public Block predAt(int i) {
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190 return getPredecessors().get(i);
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191 }
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192
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193 public Block suxAt(int i) {
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194 return getSuccessors().get(i);
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195 }
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196 // end to be inlined later on
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197
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198 public boolean dominates(Block block) {
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199 return block.isDominatedBy(this);
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200 }
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201
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202 public boolean isDominatedBy(Block block) {
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203 if (block == this) {
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204 return true;
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205 }
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206 if (dominator == null) {
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207 return false;
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208 }
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209 return dominator.isDominatedBy(block);
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210 }
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211 }