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annotate graal/GraalCompiler/src/com/sun/c1x/ir/Value.java @ 2834:bfce42cd9c07

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Graph duplication now passes all tests
author Lukas Stadler <lukas.stadler@jku.at>
date Tue, 31 May 2011 13:34:52 +0200
parents bd17ac598c6e
children 14708c03abba
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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) {
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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 }