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annotate graal/GraalCompiler/src/com/sun/c1x/ir/Instruction.java @ 2584:06b2eac2f5d3

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changed Instruction.isAppended to boolean flag (instead of next == this logic)
author Lukas Stadler <lukas.stadler@jku.at>
date Thu, 05 May 2011 14:02:34 +0200
parents 768d77a1c7af
children 3e0e65161345
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * Copyright (c) 2009, 2010, 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.*;
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29 import com.sun.c1x.value.*;
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30 import com.sun.cri.ci.*;
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31
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32 /**
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33 * Denotes an instruction node in the IR, which is a {@link Value} that
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34 * can be added to a basic block (whereas other {@link Value} nodes such as {@link Phi} and
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35 * {@link Local} cannot be added to basic blocks).
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36 *
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37 * Subclasses of instruction represent arithmetic and object operations,
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38 * control flow operators, phi statements, method calls, the start of basic blocks, and
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39 * the end of basic blocks.
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40 *
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41 * Instruction nodes are chained together in a basic block through the embedded
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42 * {@link Instruction#next} field. An Instruction may also have a list of {@link ExceptionHandler}s.
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43 */
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44 public abstract class Instruction extends Value {
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45
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46 public static final int INPUT_COUNT = 0;
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47
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48 public static final int SUCCESSOR_COUNT = 1;
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49 public static final int SUCCESSOR_NEXT = 0;
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50
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51 @Override
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52 protected int inputCount() {
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53 return super.inputCount() + INPUT_COUNT;
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54 }
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55
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56 @Override
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57 protected int successorCount() {
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58 return super.successorCount() + SUCCESSOR_COUNT;
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59 }
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60
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61 /**
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62 * Links to next instruction in a basic block, to {@code null} if this instruction is the end of a basic block or to
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63 * itself if not in a block.
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64 */
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65 public Instruction next() {
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66 return (Instruction) successors().get(super.successorCount() + SUCCESSOR_NEXT);
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67 }
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68
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69 private Node setNext(Instruction next) {
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70 return successors().set(super.successorCount() + SUCCESSOR_NEXT, next);
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71 }
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72
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73
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74 public static final int SYNCHRONIZATION_ENTRY_BCI = -1;
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75
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76 /**
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77 * Index of bytecode that generated this node when appended in a basic block.
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78 * Negative values indicate special cases.
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79 */
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80 private int bci;
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81
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82 /**
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83 * List of associated exception handlers.
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84 */
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85 private List<ExceptionHandler> exceptionHandlers = ExceptionHandler.ZERO_HANDLERS;
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86
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87
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88 private boolean isAppended = false;
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89
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90 /**
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91 * Constructs a new instruction with the specified value type.
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92 * @param kind the value type for this instruction
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93 * @param inputCount
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94 * @param successorCount
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95 */
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96 public Instruction(CiKind kind, int inputCount, int successorCount, Graph graph) {
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97 super(kind, inputCount + INPUT_COUNT, successorCount + SUCCESSOR_COUNT, graph);
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98 C1XMetrics.HIRInstructions++;
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99 }
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100
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101 public Instruction(CiKind kind) {
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102 this(kind, 0, 0, null);
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103 }
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104
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105 /**
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106 * Gets the bytecode index of this instruction.
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107 * @return the bytecode index of this instruction
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108 */
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109 public final int bci() {
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110 return bci;
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111 }
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112
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113 /**
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114 * Sets the bytecode index of this instruction.
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115 * @param bci the new bytecode index for this instruction
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116 */
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117 public final void setBCI(int bci) {
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118 assert bci >= 0 || bci == SYNCHRONIZATION_ENTRY_BCI;
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119 this.bci = bci;
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120 }
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121
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122 /**
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123 * Checks whether this instruction has already been added to its basic block.
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124 * @return {@code true} if this instruction has been added to the basic block containing it
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125 */
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126 public final boolean isAppended() {
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127 return isAppended;
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128 }
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129
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130
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131 /**
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132 * Sets the next instruction for this instruction. Note that it is illegal to
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133 * set the next field of a phi, block end, or local instruction.
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134 * @param next the next instruction
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135 * @param bci the bytecode index of the next instruction
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136 * @return the new next instruction
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137 */
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138 public final Instruction appendNext(Instruction next, int bci) {
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139 setNext(next);
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140 if (next != null) {
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141 assert !(this instanceof BlockEnd);
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142 next.setBCI(bci);
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143 next.isAppended = true;
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144 }
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145 return next;
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146 }
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147
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148 /**
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149 * Re-sets the next instruction for this instruction. Note that it is illegal to
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150 * set the next field of a phi, block end, or local instruction.
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151 * @param next the next instruction
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152 * @return the new next instruction
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153 */
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154 public final Instruction resetNext(Instruction next) {
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155 if (next != null) {
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156 assert !(this instanceof BlockEnd);
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157 setNext(next);
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158 }
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159 return next;
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160 }
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161
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162 /**
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163 * Gets the instruction preceding this instruction in the specified basic block.
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164 * Note that instructions do not directly refer to their previous instructions,
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165 * and therefore this operation much search from the beginning of the basic
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166 * block, thereby requiring time linear in the size of the basic block in the worst
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167 * case. Use with caution!
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168 * @param block the basic block that contains this instruction
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169 * @return the instruction before this instruction in the basic block
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170 */
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171 public final Instruction prev(BlockBegin block) {
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172 Instruction p = null;
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173 Instruction q = block;
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174 while (q != this) {
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175 assert q != null : "this instruction is not in the specified basic block";
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176 p = q;
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177 q = q.next();
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178 }
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179 return p;
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180 }
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181
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182 @Override
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183 public BlockBegin block() {
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184 // TODO(tw): Make this more efficient.
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185 Instruction cur = this;
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186 while (!(cur instanceof BlockEnd)) {
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187 cur = cur.next();
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188 }
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189 return ((BlockEnd) cur).begin;
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190 }
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191
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192 /**
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193 * Gets the list of exception handlers associated with this instruction.
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194 * @return the list of exception handlers for this instruction
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195 */
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196 public final List<ExceptionHandler> exceptionHandlers() {
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197 return exceptionHandlers;
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198 }
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199
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200 /**
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201 * Sets the list of exception handlers for this instruction.
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202 * @param exceptionHandlers the exception handlers
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203 */
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204 public final void setExceptionHandlers(List<ExceptionHandler> exceptionHandlers) {
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205 this.exceptionHandlers = exceptionHandlers;
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206 }
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207
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208 /**
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209 * Compute the value number of this Instruction. Local and global value numbering
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210 * optimizations use a hash map, and the value number provides a hash code.
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211 * If the instruction cannot be value numbered, then this method should return
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212 * {@code 0}.
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213 * @return the hashcode of this instruction
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214 */
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215 public int valueNumber() {
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216 return 0;
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217 }
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218
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219 /**
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220 * Checks that this instruction is equal to another instruction for the purposes
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221 * of value numbering.
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222 * @param i the other instruction
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223 * @return {@code true} if this instruction is equivalent to the specified
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224 * instruction w.r.t. value numbering
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225 */
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226 public boolean valueEqual(Instruction i) {
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227 return false;
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228 }
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229
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230 /**
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231 * Gets the name of this instruction as a string.
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232 * @return the name of this instruction
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233 */
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234 public final String name() {
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235 return getClass().getSimpleName();
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236 }
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237
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238 /**
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239 * Apply the specified closure to all the values of this instruction, including
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240 * input values, state values, and other values.
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241 * @param closure the closure to apply
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242 */
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243 public final void allValuesDo(ValueClosure closure) {
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244 inputValuesDo(closure);
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245 FrameState stateBefore = stateBefore();
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246 if (stateBefore != null) {
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247 stateBefore.valuesDo(closure);
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248 }
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249 FrameState stateAfter = stateAfter();
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250 if (stateAfter != null) {
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251 stateAfter.valuesDo(closure);
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252 }
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253 }
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254
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255 /**
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256 * Gets the state before the instruction, if it is recorded.
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257 * @return the state before the instruction
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258 */
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259 public FrameState stateBefore() {
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260 return null;
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261 }
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262
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263 /**
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264 * Gets the state after the instruction, if it is recorded. Typically only
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265 * instances of {@link BlockEnd} have a non-null state after.
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266 * @return the state after the instruction
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267 */
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268 public FrameState stateAfter() {
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269 return null;
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270 }
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271 }