Mercurial > hg > truffle
annotate graal/GraalCompiler/src/com/sun/c1x/ir/Instruction.java @ 2594:092e628ddd5d
changed Constant and Convert, more StoreIndexed changes
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Thu, 05 May 2011 15:43:23 +0200 |
parents | 3e0e65161345 |
children | 01c5c0443158 |
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 public Instruction(CiKind kind) { |
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101 this(kind, 0, 0, null); |
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102 } |
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103 |
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104 /** |
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105 * Gets the bytecode index of this instruction. |
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106 * @return the bytecode index of this instruction |
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107 */ |
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108 public final int bci() { |
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109 return bci; |
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110 } |
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111 |
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112 /** |
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113 * Sets the bytecode index of this instruction. |
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114 * @param bci the new bytecode index for this instruction |
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115 */ |
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116 public final void setBCI(int bci) { |
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117 assert bci >= 0 || bci == SYNCHRONIZATION_ENTRY_BCI; |
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118 this.bci = bci; |
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119 } |
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120 |
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121 /** |
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122 * Checks whether this instruction has already been added to its basic block. |
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123 * @return {@code true} if this instruction has been added to the basic block containing it |
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124 */ |
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125 public final boolean isAppended() { |
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126 return isAppended; |
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127 } |
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128 |
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129 |
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130 /** |
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131 * Sets the next instruction for this instruction. Note that it is illegal to |
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132 * set the next field of a phi, block end, or local instruction. |
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133 * @param next the next instruction |
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134 * @param bci the bytecode index of the next instruction |
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135 * @return the new next instruction |
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136 */ |
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137 public final Instruction appendNext(Instruction next, int bci) { |
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138 setNext(next); |
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139 if (next != null) { |
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140 assert !(this instanceof BlockEnd); |
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141 next.setBCI(bci); |
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142 next.isAppended = true; |
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143 } |
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144 return next; |
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145 } |
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146 |
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147 /** |
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148 * Re-sets the next instruction for this instruction. Note that it is illegal to |
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149 * set the next field of a phi, block end, or local instruction. |
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150 * @param next the next instruction |
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151 * @return the new next instruction |
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152 */ |
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153 public final Instruction resetNext(Instruction next) { |
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154 if (next != null) { |
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155 assert !(this instanceof BlockEnd); |
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156 setNext(next); |
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157 } |
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158 return next; |
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159 } |
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160 |
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161 /** |
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162 * Gets the instruction preceding this instruction in the specified basic block. |
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163 * Note that instructions do not directly refer to their previous instructions, |
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164 * and therefore this operation much search from the beginning of the basic |
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165 * block, thereby requiring time linear in the size of the basic block in the worst |
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166 * case. Use with caution! |
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167 * @param block the basic block that contains this instruction |
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168 * @return the instruction before this instruction in the basic block |
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169 */ |
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170 public final Instruction prev(BlockBegin block) { |
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171 Instruction p = null; |
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172 Instruction q = block; |
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173 while (q != this) { |
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174 assert q != null : "this instruction is not in the specified basic block"; |
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175 p = q; |
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176 q = q.next(); |
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177 } |
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178 return p; |
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179 } |
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180 |
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181 @Override |
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182 public BlockBegin block() { |
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183 // TODO(tw): Make this more efficient. |
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184 Instruction cur = this; |
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185 while (!(cur instanceof BlockEnd)) { |
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186 cur = cur.next(); |
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187 } |
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188 return ((BlockEnd) cur).begin; |
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189 } |
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190 |
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191 /** |
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192 * Gets the list of exception handlers associated with this instruction. |
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193 * @return the list of exception handlers for this instruction |
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194 */ |
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195 public final List<ExceptionHandler> exceptionHandlers() { |
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196 return exceptionHandlers; |
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197 } |
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198 |
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199 /** |
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200 * Sets the list of exception handlers for this instruction. |
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201 * @param exceptionHandlers the exception handlers |
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202 */ |
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203 public final void setExceptionHandlers(List<ExceptionHandler> exceptionHandlers) { |
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204 this.exceptionHandlers = exceptionHandlers; |
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205 } |
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206 |
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207 /** |
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208 * Compute the value number of this Instruction. Local and global value numbering |
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209 * optimizations use a hash map, and the value number provides a hash code. |
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210 * If the instruction cannot be value numbered, then this method should return |
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211 * {@code 0}. |
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212 * @return the hashcode of this instruction |
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213 */ |
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214 public int valueNumber() { |
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215 return 0; |
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216 } |
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217 |
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218 /** |
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219 * Checks that this instruction is equal to another instruction for the purposes |
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220 * of value numbering. |
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221 * @param i the other instruction |
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222 * @return {@code true} if this instruction is equivalent to the specified |
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223 * instruction w.r.t. value numbering |
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224 */ |
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225 public boolean valueEqual(Instruction i) { |
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226 return false; |
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227 } |
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228 |
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229 /** |
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230 * Gets the name of this instruction as a string. |
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231 * @return the name of this instruction |
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232 */ |
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233 public final String name() { |
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234 return getClass().getSimpleName(); |
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235 } |
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236 |
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237 /** |
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238 * Apply the specified closure to all the values of this instruction, including |
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239 * input values, state values, and other values. |
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240 * @param closure the closure to apply |
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241 */ |
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242 public final void allValuesDo(ValueClosure closure) { |
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243 inputValuesDo(closure); |
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244 FrameState stateBefore = stateBefore(); |
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245 if (stateBefore != null) { |
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246 stateBefore.valuesDo(closure); |
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247 } |
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248 FrameState stateAfter = stateAfter(); |
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249 if (stateAfter != null) { |
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250 stateAfter.valuesDo(closure); |
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251 } |
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252 } |
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253 |
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254 /** |
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255 * Gets the state before the instruction, if it is recorded. |
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256 * @return the state before the instruction |
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257 */ |
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258 public FrameState stateBefore() { |
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259 return null; |
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260 } |
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261 |
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262 /** |
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263 * Gets the state after the instruction, if it is recorded. Typically only |
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264 * instances of {@link BlockEnd} have a non-null state after. |
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265 * @return the state after the instruction |
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266 */ |
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267 public FrameState stateAfter() { |
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268 return null; |
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269 } |
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270 } |