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annotate graal/GraalCompiler/src/com/sun/c1x/ir/BlockBegin.java @ 2750:6048da340364

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less references to BlockBegin in BlockEnd instructions
author Lukas Stadler <lukas.stadler@jku.at>
date Fri, 20 May 2011 14:22:19 +0200
parents a3cd5eb68837
children 0d268cf66e24
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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.lir.*;
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30 import com.sun.c1x.util.*;
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31 import com.sun.c1x.value.*;
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32 import com.sun.cri.ci.*;
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33
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34 /**
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35 * Denotes the beginning of a basic block, and holds information
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36 * about the basic block, including the successor and
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37 * predecessor blocks, exception handlers, liveness information, etc.
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38 */
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39 public final class BlockBegin extends StateSplit {
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40
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41 private static final int INPUT_COUNT = 1;
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42 private static final int INPUT_STATE_BEFORE = 0;
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43
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44 private static final int SUCCESSOR_COUNT = 1;
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45 private static final int SUCCESSOR_END = 0;
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46
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47 @Override
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48 protected int inputCount() {
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49 return super.inputCount() + INPUT_COUNT;
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50 }
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51
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52 @Override
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53 protected int successorCount() {
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54 return super.successorCount() + SUCCESSOR_COUNT;
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55 }
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56
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57 /**
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58 * The last node in the block (which contains the successors).
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59 */
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60 public BlockEnd end() {
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61 return (BlockEnd) successors().get(super.successorCount() + SUCCESSOR_END);
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62 }
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63
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64 @Override
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65 public boolean needsStateAfter() {
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66 return false;
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67 }
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68
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69 public void setEnd(BlockEnd end) {
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70 assert end != null;
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71 successors().set(super.successorCount() + SUCCESSOR_END, end);
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72 }
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73
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74 /**
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75 * A unique id used in tracing.
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76 */
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77 public final int blockID;
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78
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79 private int linearScanNumber;
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80
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81 // LIR block
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82 public LIRBlock lirBlock;
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83
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84 public void setLIRBlock(LIRBlock block) {
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85 this.lirBlock = block;
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86 }
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87
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88 public LIRBlock lirBlock() {
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89 return lirBlock;
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90 }
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91
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92 /**
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93 * Index of bytecode that generated this node when appended in a basic block.
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94 * Negative values indicate special cases.
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95 */
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96 private int bci;
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97
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98 /**
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99 * Constructs a new BlockBegin at the specified bytecode index.
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100 * @param bci the bytecode index of the start
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101 * @param blockID the ID of the block
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102 * @param graph
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103 */
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104 public BlockBegin(int bci, int blockID, Graph graph) {
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105 super(CiKind.Illegal, INPUT_COUNT, SUCCESSOR_COUNT, graph);
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106 this.blockID = blockID;
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107 linearScanNumber = -1;
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108 this.bci = bci;
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109 }
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110
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111 /**
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112 * Gets the list of predecessors of this block.
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113 * @return the predecessor list
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114 */
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115 @SuppressWarnings({ "unchecked", "rawtypes" })
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116 public List<Instruction> blockPredecessors() {
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117 if (predecessors().size() == 1 && predecessors().get(0) == graph().root()) {
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118 return Collections.EMPTY_LIST;
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119 } else {
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120 return (List) Collections.unmodifiableList(predecessors());
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121 }
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122 }
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123
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124 /**
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125 * Gets the linear scan number of this block.
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126 * @return the linear scan number
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127 */
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128 public int linearScanNumber() {
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129 return linearScanNumber;
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130 }
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131
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132 public void setLinearScanNumber(int linearScanNumber) {
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133 this.linearScanNumber = linearScanNumber;
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134 }
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135
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136 /**
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137 * Iterate over this block, its exception handlers, and its successors, in that order.
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138 * @param closure the closure to apply to each block
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139 */
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140 public void iteratePreOrder(BlockClosure closure) {
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141 // XXX: identity hash map might be too slow, consider a boolean array or a mark field
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142 iterate(new IdentityHashMap<BlockBegin, BlockBegin>(), closure);
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143 }
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144
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145 /**
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146 * Iterate over all blocks transitively reachable from this block.
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147 * @param closure the closure to apply to each block
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148 * @param predecessors {@code true} if also to include this blocks predecessors
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149 */
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150 public void iterateAnyOrder(BlockClosure closure, boolean predecessors) {
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151 IdentityHashMap<BlockBegin, BlockBegin> mark = new IdentityHashMap<BlockBegin, BlockBegin>();
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152 LinkedList<BlockBegin> queue = new LinkedList<BlockBegin>();
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153 queue.offer(this);
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154 mark.put(this, this);
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155 BlockBegin block;
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156 while ((block = queue.poll()) != null) {
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157 closure.apply(block);
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158
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159 Instruction inst = block;
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160 ArrayList<BlockBegin> excBlocks = new ArrayList<BlockBegin>();
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161 while (inst != null) {
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162 if (inst instanceof ExceptionEdgeInstruction) {
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163 excBlocks.add(((ExceptionEdgeInstruction) inst).exceptionEdge());
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164 }
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165 inst = inst.next();
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166 }
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167 while (excBlocks.remove(null)) {
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168 // nothing
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169 }
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170 if (excBlocks.size() > 0) {
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171 queueBlocks(queue, excBlocks, mark);
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172 }
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173
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174 queueBlocks(queue, block.end().blockSuccessors(), mark);
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175 if (predecessors) {
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176 queueBlockEnds(queue, block.blockPredecessors(), mark);
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177 }
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178 }
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179 }
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180
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181 private void queueBlocks(LinkedList<BlockBegin> queue, List<BlockBegin> list, IdentityHashMap<BlockBegin, BlockBegin> mark) {
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182 if (list != null) {
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183 for (BlockBegin b : list) {
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184 if (!mark.containsKey(b)) {
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185 queue.offer(b);
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186 mark.put(b, b);
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187 }
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188 }
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189 }
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190 }
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191
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192 private void queueBlockEnds(LinkedList<BlockBegin> queue, List<Instruction> list, IdentityHashMap<BlockBegin, BlockBegin> mark) {
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193 if (list != null) {
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194 for (Instruction end : list) {
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195 BlockBegin b = end.block();
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196 if (!mark.containsKey(b)) {
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197 queue.offer(b);
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198 mark.put(b, b);
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199 }
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200 }
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201 }
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202 }
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203
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204 /**
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205 * Gets the bytecode index of this instruction.
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206 * @return the bytecode index of this instruction
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207 */
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208 public int bci() {
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209 return bci;
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210 }
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211
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212 private void iterate(IdentityHashMap<BlockBegin, BlockBegin> mark, BlockClosure closure) {
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213 if (!mark.containsKey(this)) {
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214 mark.put(this, this);
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215 closure.apply(this);
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216 BlockEnd e = end();
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217
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218 Instruction inst = this;
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219 ArrayList<BlockBegin> excBlocks = new ArrayList<BlockBegin>();
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220 while (inst != null) {
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221 if (inst instanceof Invoke) {
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222 excBlocks.add(((Invoke) inst).exceptionEdge());
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223 } else if (inst instanceof Throw) {
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224 excBlocks.add(((Throw) inst).exceptionEdge());
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225 }
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226 inst = inst.next();
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227 }
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228 while (excBlocks.remove(null)) {
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229 // nothing
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230 }
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231 if (excBlocks.size() > 0) {
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232 iterateReverse(mark, closure, excBlocks);
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233 }
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234
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235 assert e != null : "block must have block end";
2581
4a36a0bd6d18 added GraalGraph to classpath, Node as superclass of Value
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236 iterateReverse(mark, closure, e.blockSuccessors());
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237 }
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238 }
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239
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240 private void iterateReverse(IdentityHashMap<BlockBegin, BlockBegin> mark, BlockClosure closure, List<BlockBegin> list) {
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241 for (int i = list.size() - 1; i >= 0; i--) {
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242 list.get(i).iterate(mark, closure);
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243 }
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244 }
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245
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246 @Override
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247 public void accept(ValueVisitor v) {
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248 v.visitBlockBegin(this);
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249 }
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250
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251 @Override
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252 public String toString() {
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253 StringBuilder builder = new StringBuilder();
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254 builder.append("block #");
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255 builder.append(blockID);
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256 builder.append(",");
2741
a3cd5eb68837 more GraphBuilder cleanup, moved mergeOrClone to GraphBuilder
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257 builder.append(blockID); // was: depthFirstNumber
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258 builder.append(" [");
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259
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260 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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261 if (end() != null) {
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262 builder.append(" -> ");
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263 boolean hasSucc = false;
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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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264 for (BlockBegin s : end().blockSuccessors()) {
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265 if (hasSucc) {
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266 builder.append(", ");
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267 }
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268 builder.append("#");
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269 builder.append(s.blockID);
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270 hasSucc = true;
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271 }
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272 }
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273 return builder.toString();
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274 }
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275
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276 /**
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277 * Get the number of successors.
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278 * @return the number of successors
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279 */
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280 public int numberOfSux() {
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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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281 return end().blockSuccessorCount();
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282 }
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283
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284 /**
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285 * Get the successor at a certain position.
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286 * @param i the position
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287 * @return the successor
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288 */
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289 public BlockBegin suxAt(int i) {
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290 return end().blockSuccessor(i);
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291 }
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292
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293 /**
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294 * Get the number of predecessors.
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295 * @return the number of predecessors
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296 */
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297 public int numberOfPreds() {
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298 // ignore the graph root
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299 if (predecessors().size() == 1 && predecessors().get(0) == graph().root()) {
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300 return 0;
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301 } else {
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302 return predecessors().size();
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303 }
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304 }
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305
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306 public Instruction predAt(int j) {
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307 return (Instruction) predecessors().get(j);
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308 }
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309
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310 public void printWithoutPhis(LogStream out) {
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311 // print block id
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312 BlockEnd end = end();
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313 out.print("B").print(blockID).print(" ");
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314
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315 // print flags
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316 StringBuilder sb = new StringBuilder(8);
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317 if (sb.length() != 0) {
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318 out.print('(').print(sb.toString()).print(')');
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319 }
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320
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321 // print block bci range
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322 out.print('[').print(-1).print(", ").print(-1).print(']');
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323
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324 // print block successors
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4a36a0bd6d18 added GraalGraph to classpath, Node as superclass of Value
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325 if (end != null && end.blockSuccessors().size() > 0) {
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326 out.print(" .");
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327 for (BlockBegin successor : end.blockSuccessors()) {
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328 out.print(" B").print(successor.blockID);
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329 }
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330 }
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331
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332 // print predecessors
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333 if (!blockPredecessors().isEmpty()) {
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334 out.print(" pred:");
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335 for (Instruction pred : blockPredecessors()) {
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336 out.print(" B").print(pred.block().blockID);
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337 }
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338 }
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339 }
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340
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341 @Override
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342 public void print(LogStream out) {
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343
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344 printWithoutPhis(out);
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345
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346 // print phi functions
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347 boolean hasPhisInLocals = false;
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348 boolean hasPhisOnStack = false;
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349
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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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350 if (end() != null && end().stateAfter() != null) {
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351 FrameState state = stateBefore();
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352
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353 int i = 0;
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354 while (!hasPhisOnStack && i < state.stackSize()) {
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355 Value value = state.stackAt(i);
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356 hasPhisOnStack = isPhiAtBlock(value);
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357 if (value != null && !value.isIllegal()) {
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358 i += value.kind.sizeInSlots();
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359 } else {
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360 i++;
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361 }
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362 }
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363
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274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
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364 for (i = 0; !hasPhisInLocals && i < state.localsSize();) {
274360f98f97 Remove inlining (2nd part) removed IRScope
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365 Value value = state.localAt(i);
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366 hasPhisInLocals = isPhiAtBlock(value);
274360f98f97 Remove inlining (2nd part) removed IRScope
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367 // also ignore illegal HiWords
274360f98f97 Remove inlining (2nd part) removed IRScope
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diff changeset
368 if (value != null && !value.isIllegal()) {
274360f98f97 Remove inlining (2nd part) removed IRScope
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369 i += value.kind.sizeInSlots();
274360f98f97 Remove inlining (2nd part) removed IRScope
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parents: 2516
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370 } else {
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parents: 2516
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371 i++;
2507
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372 }
2564
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
parents: 2516
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373 }
2507
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374 }
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375
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376 // print values in locals
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377 if (hasPhisInLocals) {
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378 out.println();
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379 out.println("Locals:");
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380
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381 FrameState state = stateBefore();
2564
274360f98f97 Remove inlining (2nd part) removed IRScope
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diff changeset
382 int i = 0;
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
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383 while (i < state.localsSize()) {
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
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384 Value value = state.localAt(i);
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
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385 if (value != null) {
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
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diff changeset
386 out.println(stateString(i, value));
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
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diff changeset
387 // also ignore illegal HiWords
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
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diff changeset
388 i += value.isIllegal() ? 1 : value.kind.sizeInSlots();
274360f98f97 Remove inlining (2nd part) removed IRScope
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parents: 2516
diff changeset
389 } else {
274360f98f97 Remove inlining (2nd part) removed IRScope
Gilles Duboscq <gilles.duboscq@oracle.com>
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390 i++;
2507
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diff changeset
391 }
2564
274360f98f97 Remove inlining (2nd part) removed IRScope
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parents: 2516
diff changeset
392 }
274360f98f97 Remove inlining (2nd part) removed IRScope
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393 out.println();
2507
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394 }
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395
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396 // print values on stack
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397 if (hasPhisOnStack) {
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398 out.println();
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399 out.println("Stack:");
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diff changeset
400 int i = 0;
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401 while (i < stateBefore().stackSize()) {
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402 Value value = stateBefore().stackAt(i);
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diff changeset
403 if (value != null) {
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404 out.println(stateString(i, value));
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405 i += value.kind.sizeInSlots();
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parents:
diff changeset
406 } else {
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parents:
diff changeset
407 i++;
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
408 }
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
409 }
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
410 }
9ec15d6914ca Pull over of compiler from maxine repository.
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parents:
diff changeset
411
9ec15d6914ca Pull over of compiler from maxine repository.
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parents:
diff changeset
412 }
9ec15d6914ca Pull over of compiler from maxine repository.
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parents:
diff changeset
413
9ec15d6914ca Pull over of compiler from maxine repository.
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parents:
diff changeset
414 /**
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parents:
diff changeset
415 * Determines if a given instruction is a phi whose {@linkplain Phi#block() join block} is a given block.
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parents:
diff changeset
416 *
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parents:
diff changeset
417 * @param value the instruction to test
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parents:
diff changeset
418 * @param block the block that may be the join block of {@code value} if {@code value} is a phi
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parents:
diff changeset
419 * @return {@code true} if {@code value} is a phi and its join block is {@code block}
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parents:
diff changeset
420 */
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parents:
diff changeset
421 private boolean isPhiAtBlock(Value value) {
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parents:
diff changeset
422 return value instanceof Phi && ((Phi) value).block() == this;
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parents:
diff changeset
423 }
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parents:
diff changeset
424
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
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425
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Thomas Wuerthinger <thomas@wuerthinger.net>
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426 /**
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427 * 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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428 * block, its {@linkplain Phi#phiInputCount() inputs} are appended to the returned string.
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429 *
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430 * @param index the index of the value in the frame state
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431 * @param value the frame state value
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432 * @param block if {@code value} is a phi, then its inputs are formatted if {@code block} is its
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433 * {@linkplain Phi#block() join point}
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434 * @return the instruction representation as a string
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435 */
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436 public String stateString(int index, Value value) {
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437 StringBuilder sb = new StringBuilder(30);
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438 sb.append(String.format("%2d %s", index, Util.valueString(value)));
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439 if (value instanceof Phi) {
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440 Phi phi = (Phi) value;
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441 // print phi operands
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442 if (phi.block() == this) {
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443 sb.append(" [");
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444 for (int j = 0; j < phi.phiInputCount(); j++) {
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445 sb.append(' ');
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446 Value operand = phi.inputAt(j);
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447 if (operand != null) {
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448 sb.append(Util.valueString(operand));
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449 } else {
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450 sb.append("NULL");
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451 }
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452 }
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453 sb.append("] ");
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454 }
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455 }
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456 if (value != null && value.hasSubst()) {
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457 sb.append("alias ").append(Util.valueString(value.subst()));
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458 }
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459 return sb.toString();
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460 }
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Lukas Stadler <lukas.stadler@jku.at>
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461
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Lukas Stadler <lukas.stadler@jku.at>
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462 @Override
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Lukas Stadler <lukas.stadler@jku.at>
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463 public String shortName() {
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Lukas Stadler <lukas.stadler@jku.at>
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464 return "BlockBegin #" + blockID;
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465 }
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466
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467 /**
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468 * Iterates over all successors of this block: successors of the end node and exception handler.
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469 */
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470 public void allSuccessorsDo(boolean backwards, BlockClosure closure) {
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Lukas Stadler <lukas.stadler@jku.at>
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471 if (backwards) {
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472 for (int i = numberOfSux() - 1; i >= 0; i--) {
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473 closure.apply(suxAt(i));
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474 }
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475 } else {
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476 for (int i = 0; i < numberOfSux(); i++) {
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Lukas Stadler <lukas.stadler@jku.at>
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477 closure.apply(suxAt(i));
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478 }
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479 }
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480 for (Instruction x = next(); x != null; x = x.next()) {
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481 if (x instanceof ExceptionEdgeInstruction && ((ExceptionEdgeInstruction) x).exceptionEdge() != null) {
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482 closure.apply(((ExceptionEdgeInstruction) x).exceptionEdge());
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483 }
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484 }
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485 }
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486 }