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annotate graal/GraalCompiler/src/com/sun/c1x/ir/Value.java @ 2805:c3f64b66fc78

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Towards removing the next pointer from Constant and ArithmeticOp
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Fri, 27 May 2011 19:57:56 +0200
parents 095162a84dcc
children 015be60afcf3
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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 public enum Flag {
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37 NonNull, // this value is non-null
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38
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39 PhiDead, // phi is illegal because local is dead
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40 PhiCannotSimplify, // phi cannot be simplified
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41 PhiVisited; // phi has been visited during simplification
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42
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43 public final int mask = 1 << ordinal();
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44 }
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45
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46 /**
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47 * The kind of this value. This is {@link CiKind#Void} for instructions that produce no value.
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48 * This kind is guaranteed to be a {@linkplain CiKind#stackKind() stack kind}.
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49 */
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50 public final CiKind kind;
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51
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52 /**
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53 * A mask of {@linkplain Flag flags} denoting extra properties of this value.
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54 */
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55 private int flags;
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56
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57 protected CiValue operand = CiValue.IllegalValue;
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58
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59 /**
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60 * Creates a new value with the specified kind.
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61 * @param kind the type of this value
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62 * @param inputCount
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63 * @param successorCount
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64 * @param graph
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65 */
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66 public Value(CiKind kind, int inputCount, int successorCount, Graph graph) {
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67 super(inputCount, successorCount, graph);
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68 assert kind == kind.stackKind() : kind + " != " + kind.stackKind();
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69 this.kind = kind;
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70 }
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71
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72 ///////////////
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73 // TODO: remove when Value class changes are completed
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74
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75 @Override
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76 public Node copy(Graph into) {
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77 throw new UnsupportedOperationException();
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78 }
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79
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80 @Override
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81 protected Object clone() throws CloneNotSupportedException {
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82 throw new CloneNotSupportedException();
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83 }
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84
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85 /**
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86 * Check whether this instruction has the specified flag set.
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87 * @param flag the flag to test
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88 * @return {@code true} if this instruction has the flag
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89 */
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90 public final boolean checkFlag(Flag flag) {
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91 return (flags & flag.mask) != 0;
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92 }
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93
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94 /**
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95 * Set a flag on this instruction.
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96 * @param flag the flag to set
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97 */
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98 public final void setFlag(Flag flag) {
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99 flags |= flag.mask;
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100 }
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101
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102 /**
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103 * Clear a flag on this instruction.
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104 * @param flag the flag to set
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105 */
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106 public final void clearFlag(Flag flag) {
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107 flags &= ~flag.mask;
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108 }
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109
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110 /**
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111 * Set or clear a flag on this instruction.
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112 * @param flag the flag to set
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113 * @param val if {@code true}, set the flag, otherwise clear it
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114 */
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115 public final void setFlag(Flag flag, boolean val) {
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116 if (val) {
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117 setFlag(flag);
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118 } else {
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119 clearFlag(flag);
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120 }
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121 }
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122
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123 /**
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124 * Initialize a flag on this instruction. Assumes the flag is not initially set,
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125 * e.g. in the constructor of an instruction.
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126 * @param flag the flag to set
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127 * @param val if {@code true}, set the flag, otherwise do nothing
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128 */
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129 public final void initFlag(Flag flag, boolean val) {
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130 if (val) {
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131 setFlag(flag);
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132 }
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133 }
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134
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135 /**
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136 * Checks whether this instruction produces a value which is guaranteed to be non-null.
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137 * @return {@code true} if this instruction's value is not null
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138 */
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139 public final boolean isNonNull() {
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140 return checkFlag(Flag.NonNull);
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141 }
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142
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143 /**
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144 * Checks whether this value is a constant (i.e. it is of type {@link Constant}.
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145 * @return {@code true} if this value is a constant
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146 */
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147 public final boolean isConstant() {
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148 return this instanceof Constant;
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149 }
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150
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151 /**
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152 * Checks whether this value represents the null constant.
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153 * @return {@code true} if this value represents the null constant
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154 */
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155 public final boolean isNullConstant() {
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156 return this instanceof Constant && ((Constant) this).value.isNull();
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157 }
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158
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159 /**
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160 * Checks whether this instruction "is illegal"--i.e. it represents a dead
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161 * phi or an instruction which does not produce a value.
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162 * @return {@code true} if this instruction is illegal as an input value to another instruction
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163 */
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164 public final boolean isIllegal() {
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165 return checkFlag(Flag.PhiDead);
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166 }
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167
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168 /**
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169 * Convert this value to a constant if it is a constant, otherwise return null.
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170 * @return the {@link CiConstant} represented by this value if it is a constant; {@code null}
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171 * otherwise
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172 */
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173 public final CiConstant asConstant() {
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174 if (this instanceof Constant) {
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175 return ((Constant) this).value;
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176 }
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177 return null;
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178 }
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179
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180 /**
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181 * Gets the LIR operand associated with this instruction.
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182 * @return the LIR operand for this instruction
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183 */
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184 public final CiValue operand() {
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185 return operand;
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186 }
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187
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188 /**
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189 * Sets the LIR operand associated with this instruction.
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190 * @param operand the operand to associate with this instruction
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191 */
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192 public final void setOperand(CiValue operand) {
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193 assert this.operand.isIllegal() : "operand cannot be set twice";
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194 assert operand != null && operand.isLegal() : "operand must be legal";
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195 assert operand.kind.stackKind() == this.kind;
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196 this.operand = operand;
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197 }
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198
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199 /**
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200 * Clears the LIR operand associated with this instruction.
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201 */
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202 public final void clearOperand() {
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203 this.operand = CiValue.IllegalValue;
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204 }
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205
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206 /**
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207 * Computes the exact type of the result of this instruction, if possible.
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208 * @return the exact type of the result of this instruction, if it is known; {@code null} otherwise
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209 */
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210 public RiType exactType() {
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211 return null; // default: unknown exact type
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212 }
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213
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214 /**
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215 * Computes the declared type of the result of this instruction, if possible.
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216 * @return the declared type of the result of this instruction, if it is known; {@code null} otherwise
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217 */
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218 public RiType declaredType() {
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219 return null; // default: unknown declared type
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220 }
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221
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222 /**
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223 * Apply the specified closure to all the input values of this instruction.
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224 * @param closure the closure to apply
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225 */
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226 public void inputValuesDo(ValueClosure closure) {
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227 for (int i = 0; i < inputs().size(); i++) {
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228 inputs().set(i, closure.apply((Value) inputs().get(i)));
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229 }
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230 for (int i = 0; i < successors().size(); i++) {
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231 successors().set(i, closure.apply((Value) successors().get(i)));
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232 }
2507
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233 }
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234
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235 @Override
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236 public String toString() {
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237 StringBuilder builder = new StringBuilder();
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238 builder.append("#");
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239 builder.append(id());
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240 builder.append(' ');
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241 if (id() < 10) {
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242 builder.append(' ');
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243 }
2507
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244 builder.append(getClass().getSimpleName());
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245 builder.append(" [").append(flagsToString()).append("]");
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246 return builder.toString();
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247 }
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248
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249 public String flagsToString() {
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250 StringBuilder sb = new StringBuilder();
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251 for (Flag f : Flag.values()) {
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252 if (checkFlag(f)) {
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253 if (sb.length() != 0) {
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254 sb.append(' ');
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255 }
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256 sb.append(f.name());
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257 }
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258 }
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259 return sb.toString();
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260 }
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261
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262 public final boolean isDeadPhi() {
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263 return checkFlag(Flag.PhiDead);
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264 }
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265
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266 /**
2805
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267 * Compute the value number of this Instruction. Local and global value numbering
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268 * optimizations use a hash map, and the value number provides a hash code.
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269 * If the instruction cannot be value numbered, then this method should return
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270 * {@code 0}.
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271 * @return the hashcode of this instruction
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272 */
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273 public int valueNumber() {
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274 return 0;
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275 }
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276
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277 /**
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278 * Checks that this instruction is equal to another instruction for the purposes
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279 * of value numbering.
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280 * @param i the other instruction
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281 * @return {@code true} if this instruction is equivalent to the specified
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282 * instruction w.r.t. value numbering
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283 */
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284 public boolean valueEqual(Node i) {
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285 return false;
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286 }
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287
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288 /**
2507
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289 * This method supports the visitor pattern by accepting a visitor and calling the
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290 * appropriate {@code visit()} method.
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291 *
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292 * @param v the visitor to accept
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293 */
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294 public abstract void accept(ValueVisitor v);
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295
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296 public abstract void print(LogStream out);
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297
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298 }