Mercurial > hg > graal-compiler

annotate graal/com.oracle.max.cri/src/com/sun/cri/ci/CiValue.java @ 3733:e233f5660da4

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Added Java files from Maxine project.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 19:59:18 +0100
parents
children bc8527f3071c
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3733
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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.cri.ci;
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24
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25 import java.io.*;
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26
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27
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28
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29 /**
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30 * Abstract base class for values manipulated by the compiler. All values have a {@linkplain CiKind kind} and are immutable.
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31 */
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32 public abstract class CiValue implements Serializable {
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33
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34 public static CiValue IllegalValue = new CiValue(CiKind.Illegal) {
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35 @Override
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36 public String name() {
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37 return "<illegal>";
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38 }
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39 @Override
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40 public CiRegister asRegister() {
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41 return CiRegister.None;
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42 }
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43 @Override
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44 public int hashCode() {
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45 return -1;
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46 }
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47 @Override
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48 public boolean equals(Object obj) {
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49 return obj == this;
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50 }
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51 @Override
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52 public boolean equalsIgnoringKind(CiValue other) {
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53 return other == this;
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54 }
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55 };
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56
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57 /**
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58 * The kind of this value.
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59 */
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60 public final CiKind kind;
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61
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62 /**
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63 * Initializes a new value of the specified kind.
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64 * @param kind the kind
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65 */
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66 protected CiValue(CiKind kind) {
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67 this.kind = kind;
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68 }
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69
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70 public final boolean isVariableOrRegister() {
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71 return this instanceof CiVariable || this instanceof CiRegisterValue;
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72 }
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73
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74 public CiRegister asRegister() {
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75 throw new InternalError("Not a register: " + this);
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76 }
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77
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78 public final boolean isIllegal() {
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79 return this == IllegalValue;
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80 }
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81
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82 public final boolean isLegal() {
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83 return this != IllegalValue;
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84 }
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85
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86 /**
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87 * Determines if this value represents a slot on a stack. These values are created
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88 * by the register allocator for spill slots. They are also used to model method
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89 * parameters passed on the stack according to a specific calling convention.
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90 */
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91 public final boolean isStackSlot() {
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92 return this instanceof CiStackSlot;
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93 }
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94
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95 public final boolean isRegister() {
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96 return this instanceof CiRegisterValue;
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97 }
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98
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99 public final boolean isVariable() {
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100 return this instanceof CiVariable;
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101 }
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102
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103 public final boolean isAddress() {
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104 return this instanceof CiAddress;
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105 }
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106
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107 public final boolean isConstant() {
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108 return this instanceof CiConstant;
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109 }
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110
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111 /**
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112 * Gets a string name for this value without indicating its {@linkplain #kind kind}.
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113 */
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114 public abstract String name();
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115
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116 @Override
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117 public abstract boolean equals(Object obj);
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118
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119 public abstract boolean equalsIgnoringKind(CiValue other);
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120
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121 @Override
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122 public abstract int hashCode();
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123
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124 @Override
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125 public final String toString() {
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126 return name() + kindSuffix();
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127 }
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128
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129 public final String kindSuffix() {
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130 if (kind == CiKind.Illegal) {
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131 return "";
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132 }
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133 return ":" + kind.typeChar;
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134 }
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135
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136 public final boolean isConstant0() {
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137 return isConstant() && ((CiConstant) this).asInt() == 0;
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138 }
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139
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140 /**
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141 * Utility for specializing how a {@linkplain CiValue LIR operand} is formatted to a string.
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142 * The {@linkplain Formatter#DEFAULT default formatter} returns the value of
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143 * {@link CiValue#toString()}.
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144 */
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145 public static class Formatter {
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146 public static final Formatter DEFAULT = new Formatter();
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147
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148 /**
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149 * Formats a given operand as a string.
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150 *
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151 * @param operand the operand to format
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152 * @return {@code operand} as a string
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153 */
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154 public String format(CiValue operand) {
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155 return operand.toString();
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156 }
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157 }
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158
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159 }