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annotate graal/GraalCompiler/src/com/sun/c1x/ir/Instruction.java @ 2616:3558ca7088c0

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FrameState and Graphviz changes: * removed popx, pushx methods from GraphBuilder * FrameState subclass of Value * added String shortName() to Node * added GraphvizPrinter option to use short names * small hack in GraphvizPrinter: omit FrameState->Local connections * added GraalGraphviz to implicit classpatch (read from GRAAL env var)
author Lukas Stadler <lukas.stadler@jku.at>
date Mon, 09 May 2011 17:00:25 +0200
parents 01c5c0443158
children 91d3952f7eb7 8e44074058af
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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 private static final int INPUT_COUNT = 0;
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47
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48 private static final int SUCCESSOR_COUNT = 1;
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49 private 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 private boolean isAppended = false;
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88
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89 /**
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90 * Constructs a new instruction with the specified value type.
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91 * @param kind the value type for this instruction
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92 * @param inputCount
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93 * @param successorCount
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94 */
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95 public Instruction(CiKind kind, int inputCount, int successorCount, Graph graph) {
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96 super(kind, inputCount + INPUT_COUNT, successorCount + SUCCESSOR_COUNT, graph);
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97 C1XMetrics.HIRInstructions++;
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98 }
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99
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100 /**
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101 * Gets the bytecode index of this instruction.
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102 * @return the bytecode index of this instruction
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103 */
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104 public final int bci() {
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105 return bci;
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106 }
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107
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108 /**
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109 * Sets the bytecode index of this instruction.
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110 * @param bci the new bytecode index for this instruction
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111 */
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112 public final void setBCI(int bci) {
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113 assert bci >= 0 || bci == SYNCHRONIZATION_ENTRY_BCI;
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114 this.bci = bci;
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115 }
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116
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117 /**
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118 * Checks whether this instruction has already been added to its basic block.
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119 * @return {@code true} if this instruction has been added to the basic block containing it
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120 */
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121 public final boolean isAppended() {
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122 return isAppended;
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123 }
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124
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125
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126 /**
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127 * Sets the next instruction for this instruction. Note that it is illegal to
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128 * set the next field of a phi, block end, or local instruction.
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129 * @param next the next instruction
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130 * @param bci the bytecode index of the next instruction
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131 * @return the new next instruction
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132 */
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133 public final Instruction appendNext(Instruction next, int bci) {
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134 setNext(next);
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135 if (next != null) {
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136 assert !(this instanceof BlockEnd);
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137 next.setBCI(bci);
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138 next.isAppended = true;
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139 }
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140 return next;
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141 }
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142
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143 /**
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144 * Re-sets the next instruction for this instruction. Note that it is illegal to
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145 * set the next field of a phi, block end, or local instruction.
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146 * @param next the next instruction
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147 * @return the new next instruction
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148 */
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149 public final Instruction resetNext(Instruction next) {
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150 if (next != null) {
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151 assert !(this instanceof BlockEnd);
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152 setNext(next);
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153 }
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154 return next;
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155 }
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156
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157 /**
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158 * Gets the instruction preceding this instruction in the specified basic block.
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159 * Note that instructions do not directly refer to their previous instructions,
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160 * and therefore this operation much search from the beginning of the basic
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161 * block, thereby requiring time linear in the size of the basic block in the worst
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162 * case. Use with caution!
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163 * @param block the basic block that contains this instruction
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164 * @return the instruction before this instruction in the basic block
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165 */
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166 public final Instruction prev(BlockBegin block) {
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167 Instruction p = null;
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168 Instruction q = block;
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169 while (q != this) {
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170 assert q != null : "this instruction is not in the specified basic block";
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171 p = q;
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172 q = q.next();
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173 }
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174 return p;
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175 }
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176
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177 @Override
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178 public BlockBegin block() {
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179 // TODO(tw): Make this more efficient.
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180 Instruction cur = this;
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181 while (!(cur instanceof BlockEnd)) {
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182 cur = cur.next();
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183 }
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184 return ((BlockEnd) cur).begin;
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185 }
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186
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187 /**
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188 * Gets the list of exception handlers associated with this instruction.
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189 * @return the list of exception handlers for this instruction
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190 */
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191 public final List<ExceptionHandler> exceptionHandlers() {
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192 return exceptionHandlers;
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193 }
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194
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195 /**
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196 * Sets the list of exception handlers for this instruction.
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197 * @param exceptionHandlers the exception handlers
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198 */
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199 public final void setExceptionHandlers(List<ExceptionHandler> exceptionHandlers) {
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200 this.exceptionHandlers = exceptionHandlers;
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201 }
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202
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203 /**
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204 * Compute the value number of this Instruction. Local and global value numbering
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205 * optimizations use a hash map, and the value number provides a hash code.
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206 * If the instruction cannot be value numbered, then this method should return
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207 * {@code 0}.
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208 * @return the hashcode of this instruction
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209 */
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210 public int valueNumber() {
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211 return 0;
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212 }
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213
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214 /**
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215 * Checks that this instruction is equal to another instruction for the purposes
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216 * of value numbering.
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217 * @param i the other instruction
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218 * @return {@code true} if this instruction is equivalent to the specified
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219 * instruction w.r.t. value numbering
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220 */
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221 public boolean valueEqual(Instruction i) {
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222 return false;
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223 }
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224
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225 /**
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226 * Gets the name of this instruction as a string.
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227 * @return the name of this instruction
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228 */
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229 public final String name() {
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230 return getClass().getSimpleName();
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231 }
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232
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233 /**
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234 * Apply the specified closure to all the values of this instruction, including
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235 * input values, state values, and other values.
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236 * @param closure the closure to apply
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237 */
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238 public final void allValuesDo(ValueClosure closure) {
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239 inputValuesDo(closure);
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240 FrameState stateBefore = stateBefore();
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241 if (stateBefore != null) {
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242 stateBefore.inputValuesDo(closure);
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243 }
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244 FrameState stateAfter = stateAfter();
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245 if (stateAfter != null) {
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246 stateAfter.inputValuesDo(closure);
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247 }
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248 }
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249
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250 /**
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251 * Gets the state before the instruction, if it is recorded.
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252 * @return the state before the instruction
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253 */
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254 public FrameState stateBefore() {
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255 return null;
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256 }
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257
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258 /**
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259 * Gets the state after the instruction, if it is recorded. Typically only
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260 * instances of {@link BlockEnd} have a non-null state after.
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261 * @return the state after the instruction
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262 */
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263 public FrameState stateAfter() {
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264 return null;
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265 }
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266 }