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annotate graal/GraalCompiler/src/com/sun/c1x/ir/BlockBegin.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
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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.debug.*;
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29 import com.sun.c1x.util.*;
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30 import com.sun.c1x.value.*;
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31 import com.sun.cri.ci.*;
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32
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33 /**
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34 * Denotes the beginning of a basic block, and holds information
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35 * about the basic block, including the successor and
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36 * predecessor blocks, exception handlers, liveness information, etc.
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37 */
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38 public final class BlockBegin extends StateSplit {
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39
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40 private static final int INPUT_COUNT = 0;
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41
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42 private static final int SUCCESSOR_COUNT = 0;
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43
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44 @Override
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45 protected int inputCount() {
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46 return super.inputCount() + INPUT_COUNT;
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47 }
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48
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49 @Override
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50 protected int successorCount() {
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51 return super.successorCount() + SUCCESSOR_COUNT;
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52 }
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53
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54 /**
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55 * The last node in the block (which contains the successors).
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56 */
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57 public BlockEnd end() {
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58 Instruction next = next();
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59 while (!(next instanceof BlockEnd)) {
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60 next = next.next();
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61 }
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62 return (BlockEnd) next;
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63 }
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64
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65 @Override
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66 public boolean needsStateAfter() {
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67 return false;
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68 }
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69
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70 /**
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71 * A unique id used in tracing.
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72 */
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73 public final int blockID;
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74
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75 public final boolean isLoopHeader;
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76 private int linearScanNumber;
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77
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78 /**
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79 * Index of bytecode that generated this node when appended in a basic block.
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80 * Negative values indicate special cases.
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81 */
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82 private int bci;
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83
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84 /**
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85 * Constructs a new BlockBegin at the specified bytecode index.
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86 * @param bci the bytecode index of the start
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87 * @param blockID the ID of the block
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88 * @param graph
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89 */
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90 public BlockBegin(int bci, int blockID, boolean isLoopHeader, Graph graph) {
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91 super(CiKind.Illegal, INPUT_COUNT, SUCCESSOR_COUNT, graph);
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92 this.blockID = blockID;
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93 linearScanNumber = -1;
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94 this.bci = bci;
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95 this.isLoopHeader = isLoopHeader;
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96 }
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97
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98 /**
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99 * Gets the linear scan number of this block.
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100 * @return the linear scan number
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101 */
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102 public int linearScanNumber() {
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103 return linearScanNumber;
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104 }
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105
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106 public void setLinearScanNumber(int linearScanNumber) {
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107 this.linearScanNumber = linearScanNumber;
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108 }
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109
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110 /**
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111 * Iterate over this block, its exception handlers, and its successors, in that order.
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112 * @param closure the closure to apply to each block
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113 */
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114 public void iteratePreOrder(BlockClosure closure) {
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115 // XXX: identity hash map might be too slow, consider a boolean array or a mark field
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116 iterate(new IdentityHashMap<BlockBegin, BlockBegin>(), closure);
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117 }
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118
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119 /**
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120 * Gets the bytecode index of this instruction.
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121 * @return the bytecode index of this instruction
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122 */
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123 public int bci() {
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124 return bci;
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125 }
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126
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127 private void iterate(IdentityHashMap<BlockBegin, BlockBegin> mark, BlockClosure closure) {
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128 if (!mark.containsKey(this)) {
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129 mark.put(this, this);
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130 closure.apply(this);
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131 BlockEnd e = end();
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132
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133 Instruction inst = this;
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134 ArrayList<BlockBegin> excBlocks = new ArrayList<BlockBegin>();
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135 while (inst != null) {
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136 if (inst instanceof ExceptionEdgeInstruction) {
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137 excBlocks.add((BlockBegin) ((ExceptionEdgeInstruction) inst).exceptionEdge());
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138 }
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139 inst = inst.next();
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140 }
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141 while (excBlocks.remove(null)) {
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142 // nothing
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143 }
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144 if (excBlocks.size() > 0) {
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145 iterateReverse(mark, closure, excBlocks);
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146 }
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147
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148 assert e != null : "block must have block end";
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149 iterateReverse(mark, closure, e.blockSuccessors());
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150 }
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151 }
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152
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153 private void iterateReverse(IdentityHashMap<BlockBegin, BlockBegin> mark, BlockClosure closure, List<BlockBegin> list) {
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154 for (int i = list.size() - 1; i >= 0; i--) {
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155 list.get(i).iterate(mark, closure);
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156 }
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157 }
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158
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159 @Override
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160 public void accept(ValueVisitor v) {
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161 v.visitBlockBegin(this);
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162 }
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163
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164 @Override
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165 public String toString() {
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166 StringBuilder builder = new StringBuilder();
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167 builder.append("block #");
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168 builder.append(blockID);
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169 builder.append(",");
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a3cd5eb68837 more GraphBuilder cleanup, moved mergeOrClone to GraphBuilder
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170 builder.append(blockID); // was: depthFirstNumber
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171 builder.append(" [");
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172
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173 builder.append("]");
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dd115f80acf8 changed stateAfter FrameState to successor (instead of input), checkstyle fixes, added fixed root node to graph
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174 if (end() != null) {
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175 builder.append(" -> ");
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176 boolean hasSucc = false;
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df4c5254c5cc Towards goto removal.
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177 for (Instruction s : end().blockSuccessors()) {
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178 if (hasSucc) {
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179 builder.append(", ");
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180 }
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181 builder.append("#");
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df4c5254c5cc Towards goto removal.
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182 builder.append(s.id());
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183 hasSucc = true;
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184 }
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185 }
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186 return builder.toString();
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187 }
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188
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189 public void printWithoutPhis(LogStream out) {
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190 // print block id
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191 BlockEnd end = end();
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192 out.print("B").print(blockID).print(" ");
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193
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194 // print flags
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195 StringBuilder sb = new StringBuilder(8);
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196 if (sb.length() != 0) {
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197 out.print('(').print(sb.toString()).print(')');
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198 }
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199
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200 // print block bci range
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c1a9bf38da28 Removed bci from the Instruction class.
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201 out.print('[').print(-1).print(", ").print(-1).print(']');
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202
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203 // print block successors
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4a36a0bd6d18 added GraalGraph to classpath, Node as superclass of Value
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204 if (end != null && end.blockSuccessors().size() > 0) {
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205 out.print(" .");
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206 for (BlockBegin successor : end.blockSuccessors()) {
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207 out.print(" B").print(successor.blockID);
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208 }
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209 }
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210
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211 // print predecessors
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212 if (!blockPredecessors().isEmpty()) {
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213 out.print(" pred:");
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214 for (Instruction pred : blockPredecessors()) {
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215 out.print(" B").print(pred.block().blockID);
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216 }
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217 }
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218 }
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219
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220 @Override
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221 public void print(LogStream out) {
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222
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223 printWithoutPhis(out);
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224
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225 // print phi functions
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226 boolean hasPhisInLocals = false;
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227 boolean hasPhisOnStack = false;
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228
2621
dd115f80acf8 changed stateAfter FrameState to successor (instead of input), checkstyle fixes, added fixed root node to graph
Lukas Stadler <lukas.stadler@jku.at>
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diff changeset
229 if (end() != null && end().stateAfter() != null) {
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230 FrameState state = stateBefore();
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231
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232 int i = 0;
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233 while (!hasPhisOnStack && i < state.stackSize()) {
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234 Value value = state.stackAt(i);
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235 hasPhisOnStack = isPhiAtBlock(value);
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236 if (value != null && !value.isIllegal()) {
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237 i += value.kind.sizeInSlots();
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238 } else {
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239 i++;
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240 }
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241 }
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242
2564
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
parents: 2516
diff changeset
243 for (i = 0; !hasPhisInLocals && i < state.localsSize();) {
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
parents: 2516
diff changeset
244 Value value = state.localAt(i);
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245 hasPhisInLocals = isPhiAtBlock(value);
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
parents: 2516
diff changeset
246 // also ignore illegal HiWords
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
parents: 2516
diff changeset
247 if (value != null && !value.isIllegal()) {
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
parents: 2516
diff changeset
248 i += value.kind.sizeInSlots();
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
parents: 2516
diff changeset
249 } else {
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Gilles Duboscq <gilles.duboscq@oracle.com>
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diff changeset
250 i++;
2507
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251 }
2564
274360f98f97 Remove inlining (2nd part) removed IRScope
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252 }
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253 }
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254
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255 // print values in locals
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256 if (hasPhisInLocals) {
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257 out.println();
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258 out.println("Locals:");
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259
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260 FrameState state = stateBefore();
2564
274360f98f97 Remove inlining (2nd part) removed IRScope
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diff changeset
261 int i = 0;
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Gilles Duboscq <gilles.duboscq@oracle.com>
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diff changeset
262 while (i < state.localsSize()) {
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
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diff changeset
263 Value value = state.localAt(i);
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
parents: 2516
diff changeset
264 if (value != null) {
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
parents: 2516
diff changeset
265 out.println(stateString(i, value));
274360f98f97 Remove inlining (2nd part) removed IRScope
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parents: 2516
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266 // also ignore illegal HiWords
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
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diff changeset
267 i += value.isIllegal() ? 1 : value.kind.sizeInSlots();
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
parents: 2516
diff changeset
268 } else {
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
parents: 2516
diff changeset
269 i++;
2507
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diff changeset
270 }
2564
274360f98f97 Remove inlining (2nd part) removed IRScope
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parents: 2516
diff changeset
271 }
274360f98f97 Remove inlining (2nd part) removed IRScope
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diff changeset
272 out.println();
2507
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273 }
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274
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275 // print values on stack
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276 if (hasPhisOnStack) {
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277 out.println();
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278 out.println("Stack:");
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diff changeset
279 int i = 0;
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280 while (i < stateBefore().stackSize()) {
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281 Value value = stateBefore().stackAt(i);
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282 if (value != null) {
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283 out.println(stateString(i, value));
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284 i += value.kind.sizeInSlots();
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285 } else {
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286 i++;
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287 }
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288 }
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289 }
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290
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291 }
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292
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293 /**
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294 * Determines if a given instruction is a phi whose {@linkplain Phi#block() join block} is a given block.
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295 *
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296 * @param value the instruction to test
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297 * @param block the block that may be the join block of {@code value} if {@code value} is a phi
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298 * @return {@code true} if {@code value} is a phi and its join block is {@code block}
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299 */
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300 private boolean isPhiAtBlock(Value value) {
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301 return value instanceof Phi && ((Phi) value).block() == this;
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302 }
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303
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304
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305 /**
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306 * Formats a given instruction as a value in a {@linkplain FrameState frame state}. If the instruction is a phi defined at a given
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307 * block, its {@linkplain Phi#valueCount() inputs} are appended to the returned string.
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308 *
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309 * @param index the index of the value in the frame state
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310 * @param value the frame state value
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311 * @param block if {@code value} is a phi, then its inputs are formatted if {@code block} is its
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312 * {@linkplain Phi#block() join point}
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313 * @return the instruction representation as a string
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314 */
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315 public String stateString(int index, Value value) {
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316 StringBuilder sb = new StringBuilder(30);
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317 sb.append(String.format("%2d %s", index, Util.valueString(value)));
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318 if (value instanceof Phi) {
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319 Phi phi = (Phi) value;
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320 // print phi operands
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321 if (phi.block() == this) {
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322 sb.append(" [");
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323 for (int j = 0; j < phi.valueCount(); j++) {
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324 sb.append(' ');
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325 Value operand = phi.valueAt(j);
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326 if (operand != null) {
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327 sb.append(Util.valueString(operand));
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328 } else {
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329 sb.append("NULL");
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330 }
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331 }
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332 sb.append("] ");
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333 }
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334 }
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335 if (value != null && value.hasSubst()) {
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336 sb.append("alias ").append(Util.valueString(value.subst()));
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337 }
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338 return sb.toString();
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339 }
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340
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341 @Override
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342 public String shortName() {
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343 return "BlockBegin #" + blockID;
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344 }
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345 }