Mercurial > hg > graal-jvmci-8
annotate graal/GraalCompiler/src/com/sun/c1x/ir/Value.java @ 2821:015be60afcf3
removed flags from Value class
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Mon, 30 May 2011 17:05:06 +0200 |
parents | c3f64b66fc78 |
children | bd17ac598c6e |
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 com.oracle.graal.graph.*; |
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26 import com.sun.c1x.debug.*; |
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27 import com.sun.cri.ci.*; |
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28 import com.sun.cri.ri.*; |
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29 |
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30 /** |
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31 * This class represents a value within the HIR graph, including local variables, phis, and |
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32 * all other instructions. |
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33 */ |
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34 public abstract class Value extends Node { |
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35 |
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36 /** |
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37 * The kind of this value. This is {@link CiKind#Void} for instructions that produce no value. |
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38 * This kind is guaranteed to be a {@linkplain CiKind#stackKind() stack kind}. |
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39 */ |
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40 public final CiKind kind; |
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41 |
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42 private boolean isNonNull; |
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43 |
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44 protected CiValue operand = CiValue.IllegalValue; |
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45 |
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46 /** |
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47 * Creates a new value with the specified kind. |
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48 * @param kind the type of this value |
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49 * @param inputCount |
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50 * @param successorCount |
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51 * @param graph |
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52 */ |
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53 public Value(CiKind kind, int inputCount, int successorCount, Graph graph) { |
2603 | 54 super(inputCount, successorCount, graph); |
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55 assert kind == kind.stackKind() : kind + " != " + kind.stackKind(); |
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56 this.kind = kind; |
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57 } |
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58 |
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59 /////////////// |
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60 // TODO: remove when Value class changes are completed |
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61 |
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62 @Override |
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63 public Node copy(Graph into) { |
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64 throw new UnsupportedOperationException(); |
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65 } |
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66 |
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67 @Override |
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68 protected Object clone() throws CloneNotSupportedException { |
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69 throw new CloneNotSupportedException(); |
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70 } |
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71 |
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72 /** |
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73 * Checks whether this instruction produces a value which is guaranteed to be non-null. |
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74 * @return {@code true} if this instruction's value is not null |
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75 */ |
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76 public boolean isNonNull() { |
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77 return isNonNull; |
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78 } |
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79 |
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80 public void setNonNull(boolean isNonNull) { |
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81 this.isNonNull = isNonNull; |
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82 } |
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83 |
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84 /** |
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85 * Checks whether this value is a constant (i.e. it is of type {@link Constant}. |
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86 * @return {@code true} if this value is a constant |
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87 */ |
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88 public final boolean isConstant() { |
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89 return this instanceof Constant; |
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90 } |
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91 |
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92 /** |
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93 * Checks whether this value represents the null constant. |
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94 * @return {@code true} if this value represents the null constant |
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95 */ |
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96 public final boolean isNullConstant() { |
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97 return this instanceof Constant && ((Constant) this).value.isNull(); |
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98 } |
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99 |
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100 /** |
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101 * Convert this value to a constant if it is a constant, otherwise return null. |
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102 * @return the {@link CiConstant} represented by this value if it is a constant; {@code null} |
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103 * otherwise |
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104 */ |
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105 public final CiConstant asConstant() { |
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106 if (this instanceof Constant) { |
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107 return ((Constant) this).value; |
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108 } |
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109 return null; |
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110 } |
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111 |
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112 /** |
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113 * Gets the LIR operand associated with this instruction. |
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114 * @return the LIR operand for this instruction |
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115 */ |
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116 public final CiValue operand() { |
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117 return operand; |
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118 } |
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119 |
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120 /** |
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121 * Sets the LIR operand associated with this instruction. |
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122 * @param operand the operand to associate with this instruction |
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123 */ |
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124 public final void setOperand(CiValue operand) { |
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125 assert this.operand.isIllegal() : "operand cannot be set twice"; |
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126 assert operand != null && operand.isLegal() : "operand must be legal"; |
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127 assert operand.kind.stackKind() == this.kind; |
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128 this.operand = operand; |
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129 } |
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130 |
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131 /** |
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132 * Clears the LIR operand associated with this instruction. |
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133 */ |
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134 public final void clearOperand() { |
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135 this.operand = CiValue.IllegalValue; |
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136 } |
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137 |
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138 /** |
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139 * Computes the exact type of the result of this instruction, if possible. |
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140 * @return the exact type of the result of this instruction, if it is known; {@code null} otherwise |
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141 */ |
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142 public RiType exactType() { |
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143 return null; // default: unknown exact type |
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144 } |
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145 |
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146 /** |
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147 * Computes the declared type of the result of this instruction, if possible. |
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148 * @return the declared type of the result of this instruction, if it is known; {@code null} otherwise |
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149 */ |
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150 public RiType declaredType() { |
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151 return null; // default: unknown declared type |
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152 } |
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153 |
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154 /** |
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155 * Apply the specified closure to all the input values of this instruction. |
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156 * @param closure the closure to apply |
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157 */ |
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158 public void inputValuesDo(ValueClosure closure) { |
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159 for (int i = 0; i < inputs().size(); i++) { |
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160 inputs().set(i, closure.apply((Value) inputs().get(i))); |
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161 } |
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162 for (int i = 0; i < successors().size(); i++) { |
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163 successors().set(i, closure.apply((Value) successors().get(i))); |
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164 } |
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165 } |
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166 |
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167 @Override |
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168 public String toString() { |
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169 StringBuilder builder = new StringBuilder(); |
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170 builder.append("#"); |
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171 builder.append(id()); |
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172 builder.append(' '); |
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173 if (id() < 10) { |
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174 builder.append(' '); |
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175 } |
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176 builder.append(getClass().getSimpleName()); |
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177 builder.append(" [").append(flagsToString()).append("]"); |
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178 return builder.toString(); |
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179 } |
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180 |
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181 public String flagsToString() { |
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182 StringBuilder sb = new StringBuilder(); |
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183 if (isNonNull()) { |
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184 sb.append("NonNull"); |
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185 } |
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186 return sb.toString(); |
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187 } |
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188 |
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189 /** |
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190 * Compute the value number of this Instruction. Local and global value numbering |
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191 * optimizations use a hash map, and the value number provides a hash code. |
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192 * If the instruction cannot be value numbered, then this method should return |
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193 * {@code 0}. |
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194 * @return the hashcode of this instruction |
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195 */ |
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196 public int valueNumber() { |
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197 return 0; |
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198 } |
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199 |
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200 /** |
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201 * Checks that this instruction is equal to another instruction for the purposes |
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202 * of value numbering. |
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203 * @param i the other instruction |
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204 * @return {@code true} if this instruction is equivalent to the specified |
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205 * instruction w.r.t. value numbering |
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206 */ |
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207 public boolean valueEqual(Node i) { |
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208 return false; |
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209 } |
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210 |
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211 /** |
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212 * This method supports the visitor pattern by accepting a visitor and calling the |
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213 * appropriate {@code visit()} method. |
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214 * |
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215 * @param v the visitor to accept |
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216 */ |
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217 public abstract void accept(ValueVisitor v); |
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218 |
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219 public abstract void print(LogStream out); |
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220 |
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221 } |