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annotate graal/GraalCompiler/src/com/sun/c1x/ir/BlockBegin.java @ 2773:27512ea6bbcb

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exception dispatch simplification: * BlockMap creates exception dispatch blocks (so they're iterated in the right order) * GraphBuilder uses exception dispatch blocks, simplified handleException, removed updateDispatchChain * simplified mergeOrClone * removed successor & predecessor methods from BlockBegin
author Lukas Stadler <lukas.stadler@jku.at>
date Tue, 24 May 2011 12:07:17 +0200
parents 43ffa0e47a46
children 93ec3f067420 bda5972a40a5
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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.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 = 1;
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41 private static final int INPUT_STATE_BEFORE = 0;
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42
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43 private static final int SUCCESSOR_COUNT = 0;
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44
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45 @Override
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46 protected int inputCount() {
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47 return super.inputCount() + INPUT_COUNT;
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48 }
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49
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50 @Override
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51 protected int successorCount() {
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52 return super.successorCount() + SUCCESSOR_COUNT;
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53 }
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54
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55 /**
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56 * The last node in the block (which contains the successors).
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57 */
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58 public BlockEnd end() {
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59 Instruction next = next();
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60 while (!(next instanceof BlockEnd)) {
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61 next = next.next();
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62 }
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63 return (BlockEnd) next;
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64 }
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65
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66 @Override
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67 public boolean needsStateAfter() {
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68 return false;
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69 }
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70
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71 /**
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72 * A unique id used in tracing.
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73 */
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74 public final int blockID;
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75
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76 public final boolean isLoopHeader;
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77 private int linearScanNumber;
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78
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79 /**
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80 * Index of bytecode that generated this node when appended in a basic block.
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81 * Negative values indicate special cases.
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82 */
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83 private int bci;
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84
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85 /**
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86 * Constructs a new BlockBegin at the specified bytecode index.
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87 * @param bci the bytecode index of the start
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88 * @param blockID the ID of the block
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89 * @param graph
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90 */
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91 public BlockBegin(int bci, int blockID, boolean isLoopHeader, Graph graph) {
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92 super(CiKind.Illegal, INPUT_COUNT, SUCCESSOR_COUNT, graph);
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93 this.blockID = blockID;
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94 linearScanNumber = -1;
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95 this.bci = bci;
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96 this.isLoopHeader = isLoopHeader;
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97 }
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98
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99 /**
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100 * Gets the linear scan number of this block.
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101 * @return the linear scan number
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102 */
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103 public int linearScanNumber() {
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104 return linearScanNumber;
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105 }
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106
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107 public void setLinearScanNumber(int linearScanNumber) {
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108 this.linearScanNumber = linearScanNumber;
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109 }
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110
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111 /**
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112 * Iterate over this block, its exception handlers, and its successors, in that order.
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113 * @param closure the closure to apply to each block
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114 */
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115 public void iteratePreOrder(BlockClosure closure) {
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116 // XXX: identity hash map might be too slow, consider a boolean array or a mark field
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117 iterate(new IdentityHashMap<BlockBegin, BlockBegin>(), closure);
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118 }
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119
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120 /**
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121 * Gets the bytecode index of this instruction.
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122 * @return the bytecode index of this instruction
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123 */
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124 public int bci() {
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125 return bci;
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126 }
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127
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128 private void iterate(IdentityHashMap<BlockBegin, BlockBegin> mark, BlockClosure closure) {
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129 if (!mark.containsKey(this)) {
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130 mark.put(this, this);
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131 closure.apply(this);
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132 BlockEnd e = end();
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133
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134 Instruction inst = this;
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135 ArrayList<BlockBegin> excBlocks = new ArrayList<BlockBegin>();
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136 while (inst != null) {
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137 if (inst instanceof ExceptionEdgeInstruction) {
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138 excBlocks.add(((ExceptionEdgeInstruction) inst).exceptionEdge());
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139 }
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140 inst = inst.next();
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141 }
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142 while (excBlocks.remove(null)) {
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143 // nothing
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144 }
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145 if (excBlocks.size() > 0) {
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146 iterateReverse(mark, closure, excBlocks);
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147 }
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148
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149 assert e != null : "block must have block end";
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150 iterateReverse(mark, closure, e.blockSuccessors());
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151 }
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152 }
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153
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154 private void iterateReverse(IdentityHashMap<BlockBegin, BlockBegin> mark, BlockClosure closure, List<BlockBegin> list) {
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155 for (int i = list.size() - 1; i >= 0; i--) {
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156 list.get(i).iterate(mark, closure);
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157 }
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158 }
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159
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160 @Override
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161 public void accept(ValueVisitor v) {
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162 v.visitBlockBegin(this);
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163 }
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164
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165 @Override
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166 public String toString() {
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167 StringBuilder builder = new StringBuilder();
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168 builder.append("block #");
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169 builder.append(blockID);
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170 builder.append(",");
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a3cd5eb68837 more GraphBuilder cleanup, moved mergeOrClone to GraphBuilder
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171 builder.append(blockID); // was: depthFirstNumber
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172 builder.append(" [");
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173
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174 builder.append("]");
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175 if (end() != null) {
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176 builder.append(" -> ");
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177 boolean hasSucc = false;
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178 for (BlockBegin s : end().blockSuccessors()) {
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179 if (hasSucc) {
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180 builder.append(", ");
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181 }
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182 builder.append("#");
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183 builder.append(s.blockID);
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184 hasSucc = true;
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185 }
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186 }
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187 return builder.toString();
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188 }
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189
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190 public void printWithoutPhis(LogStream out) {
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191 // print block id
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192 BlockEnd end = end();
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193 out.print("B").print(blockID).print(" ");
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194
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195 // print flags
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196 StringBuilder sb = new StringBuilder(8);
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197 if (sb.length() != 0) {
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198 out.print('(').print(sb.toString()).print(')');
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199 }
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200
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201 // print block bci range
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c1a9bf38da28 Removed bci from the Instruction class.
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202 out.print('[').print(-1).print(", ").print(-1).print(']');
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203
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204 // print block successors
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205 if (end != null && end.blockSuccessors().size() > 0) {
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206 out.print(" .");
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207 for (BlockBegin successor : end.blockSuccessors()) {
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208 out.print(" B").print(successor.blockID);
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209 }
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210 }
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211
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212 // print predecessors
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213 if (!blockPredecessors().isEmpty()) {
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214 out.print(" pred:");
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215 for (Instruction pred : blockPredecessors()) {
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216 out.print(" B").print(pred.block().blockID);
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217 }
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218 }
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219 }
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220
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221 @Override
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222 public void print(LogStream out) {
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223
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224 printWithoutPhis(out);
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225
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226 // print phi functions
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227 boolean hasPhisInLocals = false;
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228 boolean hasPhisOnStack = false;
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229
2621
dd115f80acf8 changed stateAfter FrameState to successor (instead of input), checkstyle fixes, added fixed root node to graph
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230 if (end() != null && end().stateAfter() != null) {
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231 FrameState state = stateBefore();
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232
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233 int i = 0;
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234 while (!hasPhisOnStack && i < state.stackSize()) {
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235 Value value = state.stackAt(i);
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236 hasPhisOnStack = isPhiAtBlock(value);
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237 if (value != null && !value.isIllegal()) {
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238 i += value.kind.sizeInSlots();
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239 } else {
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240 i++;
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241 }
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242 }
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243
2564
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
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244 for (i = 0; !hasPhisInLocals && i < state.localsSize();) {
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
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245 Value value = state.localAt(i);
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246 hasPhisInLocals = isPhiAtBlock(value);
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
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247 // also ignore illegal HiWords
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248 if (value != null && !value.isIllegal()) {
274360f98f97 Remove inlining (2nd part) removed IRScope
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249 i += value.kind.sizeInSlots();
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250 } else {
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251 i++;
2507
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252 }
2564
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253 }
2507
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254 }
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255
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256 // print values in locals
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257 if (hasPhisInLocals) {
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258 out.println();
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259 out.println("Locals:");
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260
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261 FrameState state = stateBefore();
2564
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262 int i = 0;
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263 while (i < state.localsSize()) {
274360f98f97 Remove inlining (2nd part) removed IRScope
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264 Value value = state.localAt(i);
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265 if (value != null) {
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266 out.println(stateString(i, value));
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267 // also ignore illegal HiWords
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diff changeset
268 i += value.isIllegal() ? 1 : value.kind.sizeInSlots();
274360f98f97 Remove inlining (2nd part) removed IRScope
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parents: 2516
diff changeset
269 } else {
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Gilles Duboscq <gilles.duboscq@oracle.com>
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diff changeset
270 i++;
2507
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diff changeset
271 }
2564
274360f98f97 Remove inlining (2nd part) removed IRScope
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diff changeset
272 }
274360f98f97 Remove inlining (2nd part) removed IRScope
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273 out.println();
2507
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274 }
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275
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276 // print values on stack
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277 if (hasPhisOnStack) {
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278 out.println();
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279 out.println("Stack:");
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280 int i = 0;
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281 while (i < stateBefore().stackSize()) {
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282 Value value = stateBefore().stackAt(i);
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283 if (value != null) {
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284 out.println(stateString(i, value));
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285 i += value.kind.sizeInSlots();
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286 } else {
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287 i++;
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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 /**
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295 * Determines if a given instruction is a phi whose {@linkplain Phi#block() join block} is a given block.
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296 *
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297 * @param value the instruction to test
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298 * @param block the block that may be the join block of {@code value} if {@code value} is a phi
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299 * @return {@code true} if {@code value} is a phi and its join block is {@code block}
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300 */
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301 private boolean isPhiAtBlock(Value value) {
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302 return value instanceof Phi && ((Phi) value).block() == this;
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303 }
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304
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305
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306 /**
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307 * 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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308 * block, its {@linkplain Phi#valueCount() inputs} are appended to the returned string.
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309 *
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310 * @param index the index of the value in the frame state
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311 * @param value the frame state value
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312 * @param block if {@code value} is a phi, then its inputs are formatted if {@code block} is its
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313 * {@linkplain Phi#block() join point}
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314 * @return the instruction representation as a string
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315 */
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316 public String stateString(int index, Value value) {
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317 StringBuilder sb = new StringBuilder(30);
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318 sb.append(String.format("%2d %s", index, Util.valueString(value)));
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319 if (value instanceof Phi) {
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320 Phi phi = (Phi) value;
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321 // print phi operands
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322 if (phi.block() == this) {
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323 sb.append(" [");
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324 for (int j = 0; j < phi.valueCount(); j++) {
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325 sb.append(' ');
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326 Value operand = phi.valueAt(j);
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327 if (operand != null) {
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328 sb.append(Util.valueString(operand));
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329 } else {
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330 sb.append("NULL");
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331 }
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332 }
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333 sb.append("] ");
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334 }
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335 }
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336 if (value != null && value.hasSubst()) {
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337 sb.append("alias ").append(Util.valueString(value.subst()));
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338 }
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339 return sb.toString();
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340 }
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341
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342 @Override
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343 public String shortName() {
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344 return "BlockBegin #" + blockID;
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345 }
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346
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347 /**
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348 * Iterates over all successors of this block: successors of the end node and exception handler.
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349 */
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350 public void allSuccessorsDo(boolean backwards, BlockClosure closure) {
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351 BlockEnd end = end();
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352 if (backwards) {
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353 for (int i = end.blockSuccessorCount() - 1; i >= 0; i--) {
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354 closure.apply(end.blockSuccessor(i));
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355 }
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356 } else {
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357 for (int i = 0; i < end.blockSuccessorCount(); i++) {
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358 closure.apply(end.blockSuccessor(i));
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359 }
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360 }
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361 for (Instruction x = next(); x != null; x = x.next()) {
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362 if (x instanceof ExceptionEdgeInstruction && ((ExceptionEdgeInstruction) x).exceptionEdge() != null) {
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363 closure.apply(((ExceptionEdgeInstruction) x).exceptionEdge());
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364 }
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365 }
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366 }
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367 }