Mercurial > hg > graal-jvmci-8
annotate graal/GraalCompiler/src/com/sun/c1x/ir/Instruction.java @ 2603:01c5c0443158
new node layout: Phi
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Fri, 06 May 2011 11:18:15 +0200 |
parents | 3e0e65161345 |
children | 3558ca7088c0 |
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 |
2585 | 46 private static final int INPUT_COUNT = 0; |
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47 |
2585 | 48 private static final int SUCCESSOR_COUNT = 1; |
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.valuesDo(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.valuesDo(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 } |