Mercurial > hg > truffle
annotate graal/GraalCompiler/src/com/sun/c1x/ir/Value.java @ 2848:c061a6be3728
merge
author | Gilles Duboscq <gilles.duboscq@oracle.com> |
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date | Tue, 31 May 2011 15:19:30 +0200 |
parents | bfce42cd9c07 |
children | 14708c03abba |
rev | line source |
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1 /* |
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2 * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.sun.c1x.ir; |
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24 |
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25 import java.util.*; |
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26 |
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27 import com.oracle.graal.graph.*; |
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28 import com.sun.c1x.debug.*; |
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29 import com.sun.cri.ci.*; |
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30 import com.sun.cri.ri.*; |
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31 |
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32 /** |
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33 * This class represents a value within the HIR graph, including local variables, phis, and |
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34 * all other instructions. |
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35 */ |
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36 public abstract class Value extends Node { |
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37 |
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38 /** |
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39 * The kind of this value. This is {@link CiKind#Void} for instructions that produce no value. |
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40 * This kind is guaranteed to be a {@linkplain CiKind#stackKind() stack kind}. |
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41 */ |
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42 public final CiKind kind; |
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43 |
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44 private boolean isNonNull; |
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45 |
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46 protected CiValue operand = CiValue.IllegalValue; |
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47 |
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48 /** |
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49 * Creates a new value with the specified kind. |
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50 * @param kind the type of this value |
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51 * @param inputCount |
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52 * @param successorCount |
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53 * @param graph |
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54 */ |
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55 public Value(CiKind kind, int inputCount, int successorCount, Graph graph) { |
2603 | 56 super(inputCount, successorCount, graph); |
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57 assert kind == kind.stackKind() : kind + " != " + kind.stackKind(); |
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58 this.kind = kind; |
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59 } |
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60 |
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61 /////////////// |
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62 // TODO: remove when Value class changes are completed |
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63 |
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64 @Override |
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65 protected Object clone() throws CloneNotSupportedException { |
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66 throw new CloneNotSupportedException(); |
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67 } |
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68 |
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69 /** |
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70 * Checks whether this instruction produces a value which is guaranteed to be non-null. |
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71 * @return {@code true} if this instruction's value is not null |
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72 */ |
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73 public boolean isNonNull() { |
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74 return isNonNull; |
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75 } |
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76 |
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77 public void setNonNull(boolean isNonNull) { |
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78 this.isNonNull = isNonNull; |
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79 } |
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80 |
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81 /** |
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82 * Checks whether this value is a constant (i.e. it is of type {@link Constant}. |
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83 * @return {@code true} if this value is a constant |
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84 */ |
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85 public final boolean isConstant() { |
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86 return this instanceof Constant; |
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87 } |
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88 |
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89 /** |
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90 * Checks whether this value represents the null constant. |
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91 * @return {@code true} if this value represents the null constant |
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92 */ |
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93 public final boolean isNullConstant() { |
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94 return this instanceof Constant && ((Constant) this).value.isNull(); |
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95 } |
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96 |
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97 /** |
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98 * Convert this value to a constant if it is a constant, otherwise return null. |
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99 * @return the {@link CiConstant} represented by this value if it is a constant; {@code null} |
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100 * otherwise |
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101 */ |
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102 public final CiConstant asConstant() { |
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103 if (this instanceof Constant) { |
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104 return ((Constant) this).value; |
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105 } |
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106 return null; |
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107 } |
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108 |
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109 /** |
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110 * Gets the LIR operand associated with this instruction. |
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111 * @return the LIR operand for this instruction |
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112 */ |
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113 public final CiValue operand() { |
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114 return operand; |
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115 } |
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116 |
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117 /** |
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118 * Sets the LIR operand associated with this instruction. |
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119 * @param operand the operand to associate with this instruction |
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120 */ |
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121 public final void setOperand(CiValue operand) { |
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122 assert this.operand.isIllegal() : "operand cannot be set twice"; |
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123 assert operand != null && operand.isLegal() : "operand must be legal"; |
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124 assert operand.kind.stackKind() == this.kind; |
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125 this.operand = operand; |
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126 } |
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127 |
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128 /** |
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129 * Clears the LIR operand associated with this instruction. |
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130 */ |
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131 public final void clearOperand() { |
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132 this.operand = CiValue.IllegalValue; |
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133 } |
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134 |
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135 /** |
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136 * Computes the exact type of the result of this instruction, if possible. |
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137 * @return the exact type of the result of this instruction, if it is known; {@code null} otherwise |
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138 */ |
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139 public RiType exactType() { |
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140 return null; // default: unknown exact type |
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141 } |
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142 |
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143 /** |
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144 * Computes the declared type of the result of this instruction, if possible. |
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145 * @return the declared type of the result of this instruction, if it is known; {@code null} otherwise |
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146 */ |
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147 public RiType declaredType() { |
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148 return null; // default: unknown declared type |
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149 } |
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150 |
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151 /** |
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152 * Apply the specified closure to all the input values of this instruction. |
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153 * @param closure the closure to apply |
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154 */ |
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155 public void inputValuesDo(ValueClosure closure) { |
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156 for (int i = 0; i < inputs().size(); i++) { |
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157 inputs().set(i, closure.apply((Value) inputs().get(i))); |
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158 } |
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159 for (int i = 0; i < successors().size(); i++) { |
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160 successors().set(i, closure.apply((Value) successors().get(i))); |
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161 } |
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162 } |
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163 |
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164 @Override |
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165 public String toString() { |
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166 StringBuilder builder = new StringBuilder(); |
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167 builder.append("#"); |
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168 builder.append(id()); |
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169 builder.append(' '); |
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170 if (id() < 10) { |
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171 builder.append(' '); |
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172 } |
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173 builder.append(getClass().getSimpleName()); |
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174 builder.append(" [").append(flagsToString()).append("]"); |
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175 return builder.toString(); |
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176 } |
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177 |
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178 public String flagsToString() { |
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179 StringBuilder sb = new StringBuilder(); |
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180 if (isNonNull()) { |
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181 sb.append("NonNull"); |
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182 } |
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183 return sb.toString(); |
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184 } |
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185 |
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186 /** |
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187 * Compute the value number of this Instruction. Local and global value numbering |
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188 * optimizations use a hash map, and the value number provides a hash code. |
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189 * If the instruction cannot be value numbered, then this method should return |
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190 * {@code 0}. |
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191 * @return the hashcode of this instruction |
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192 */ |
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193 public int valueNumber() { |
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194 return 0; |
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195 } |
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196 |
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197 /** |
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198 * Checks that this instruction is equal to another instruction for the purposes |
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199 * of value numbering. |
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200 * @param i the other instruction |
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201 * @return {@code true} if this instruction is equivalent to the specified |
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202 * instruction w.r.t. value numbering |
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203 */ |
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204 public boolean valueEqual(Node i) { |
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205 return false; |
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206 } |
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207 |
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208 /** |
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209 * This method supports the visitor pattern by accepting a visitor and calling the |
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210 * appropriate {@code visit()} method. |
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211 * |
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212 * @param v the visitor to accept |
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213 */ |
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214 public abstract void accept(ValueVisitor v); |
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215 |
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216 public abstract void print(LogStream out); |
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217 |
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218 @Override |
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219 public Map<Object, Object> getDebugProperties() { |
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220 Map<Object, Object> properties = super.getDebugProperties(); |
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221 properties.put("kind", kind.toString()); |
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222 properties.put("nonNull", isNonNull); |
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223 properties.put("operand", operand == null ? "null" : operand.toString()); |
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224 return properties; |
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225 } |
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226 |
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227 |
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228 } |