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annotate graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/Register.java @ 7805:0e58445d54df

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Integration fixes.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Mon, 18 Feb 2013 16:04:25 -0800
parents 447f9ba1962b
children cf470d096a8f
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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.oracle.graal.api.code;
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24
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25 import java.io.*;
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26 import java.util.*;
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27
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28 import com.oracle.graal.api.meta.*;
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29
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30 /**
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31 * Represents a target machine register.
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32 */
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33 public final class Register implements Comparable<Register>, Serializable {
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34
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35 private static final long serialVersionUID = -7213269157816016300L;
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36
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37 /**
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38 * Invalid register.
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39 */
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40 public static final Register None = new Register(-1, -1, 0, "noreg");
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41
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42 /**
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43 * Frame pointer of the current method. All spill slots and outgoing stack-based arguments are
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44 * addressed relative to this register.
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45 */
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46 public static final Register Frame = new Register(-2, -2, 0, "framereg", RegisterFlag.CPU);
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47
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48 public static final Register CallerFrame = new Register(-3, -3, 0, "callerframereg", RegisterFlag.CPU);
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49
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50 /**
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51 * The identifier for this register that is unique across all the registers in a
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52 * {@link Architecture}. A valid register has {@code number > 0}.
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53 */
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54 public final int number;
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55
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56 /**
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57 * The mnemonic of this register.
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58 */
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59 public final String name;
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60
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61 /**
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62 * The actual encoding in a target machine instruction for this register, which may or may not
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63 * be the same as {@link #number}.
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64 */
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65 public final int encoding;
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66
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67 /**
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68 * The assembler calls this method to get the register's encoding.
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69 */
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70 public int encoding() {
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71 return encoding;
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72 }
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73
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74 /**
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75 * The size of the stack slot used to spill the value of this register.
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76 */
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77 public final int spillSlotSize;
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78
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79 /**
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80 * The set of {@link RegisterFlag} values associated with this register.
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81 */
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82 private final int flags;
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83
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84 /**
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85 * An array of {@link RegisterValue} objects, for this register, with one entry per {@link Kind}
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86 * , indexed by {@link Kind#ordinal}.
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87 */
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88 private final RegisterValue[] values;
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89
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90 /**
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91 * Attributes that characterize a register in a useful way.
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92 *
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93 */
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94 public enum RegisterFlag {
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95 /**
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96 * Denotes an integral (i.e. non floating point) register.
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97 */
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98 CPU,
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99
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100 /**
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101 * Denotes a register whose lowest order byte can be addressed separately.
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102 */
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103 Byte,
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104
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105 /**
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106 * Denotes a floating point register.
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107 */
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108 FPU;
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109
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110 public final int mask = 1 << (ordinal() + 1);
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111 }
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112
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113 /**
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114 * Creates a {@link Register} instance.
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115 *
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116 * @param number unique identifier for the register
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117 * @param encoding the target machine encoding for the register
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118 * @param spillSlotSize the size of the stack slot used to spill the value of the register
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119 * @param name the mnemonic name for the register
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120 * @param flags the set of {@link RegisterFlag} values for the register
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121 */
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122 public Register(int number, int encoding, int spillSlotSize, String name, RegisterFlag... flags) {
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123 this.number = number;
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124 this.name = name;
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125 this.spillSlotSize = spillSlotSize;
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126 this.flags = createMask(flags);
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127 this.encoding = encoding;
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128
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129 values = new RegisterValue[Kind.values().length];
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130 for (Kind kind : Kind.values()) {
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131 values[kind.ordinal()] = new RegisterValue(kind, this);
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132 }
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133 }
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134
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135 private static int createMask(RegisterFlag... flags) {
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136 int result = 0;
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137 for (RegisterFlag f : flags) {
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138 result |= f.mask;
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139 }
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140 return result;
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141 }
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142
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143 public boolean isSet(RegisterFlag f) {
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144 return (flags & f.mask) != 0;
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145 }
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146
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147 /**
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148 * Gets this register as a {@linkplain RegisterValue value} with a specified kind.
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149 *
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150 * @param kind the specified kind
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151 * @return the {@link RegisterValue}
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152 */
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153 public RegisterValue asValue(Kind kind) {
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154 return values[kind.ordinal()];
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155 }
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156
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157 /**
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158 * Gets this register as a {@linkplain RegisterValue value} with no particular kind.
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159 *
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160 * @return a {@link RegisterValue} with {@link Kind#Illegal} kind.
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161 */
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162 public RegisterValue asValue() {
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a891c53a295b Renaming RiKind => Kind.
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163 return asValue(Kind.Illegal);
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164 }
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165
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166 /**
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167 * Determines if this is a valid register.
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diff changeset
168 *
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169 * @return {@code true} iff this register is valid
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170 */
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171 public boolean isValid() {
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172 return number >= 0;
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173 }
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174
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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175 /**
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176 * Determines if this a floating point register.
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177 */
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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178 public boolean isFpu() {
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179 return isSet(RegisterFlag.FPU);
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180 }
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181
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parents:
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182 /**
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183 * Determines if this a general purpose register.
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184 */
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185 public boolean isCpu() {
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186 return isSet(RegisterFlag.CPU);
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187 }
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188
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189 /**
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diff changeset
190 * Determines if this register has the {@link RegisterFlag#Byte} attribute set.
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191 *
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192 * @return {@code true} iff this register has the {@link RegisterFlag#Byte} attribute set.
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193 */
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194 public boolean isByte() {
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195 return isSet(RegisterFlag.Byte);
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196 }
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197
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198 /**
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199 * Categorizes a set of registers by {@link RegisterFlag}.
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200 *
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201 * @param registers a list of registers to be categorized
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202 * @return a map from each {@link RegisterFlag} constant to the list of registers for which the
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203 * flag is {@linkplain #isSet(RegisterFlag) set}
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204 */
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205 public static EnumMap<RegisterFlag, Register[]> categorize(Register[] registers) {
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206 EnumMap<RegisterFlag, Register[]> result = new EnumMap<>(RegisterFlag.class);
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diff changeset
207 for (RegisterFlag flag : RegisterFlag.values()) {
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208 ArrayList<Register> list = new ArrayList<>();
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diff changeset
209 for (Register r : registers) {
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diff changeset
210 if (r.isSet(flag)) {
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diff changeset
211 list.add(r);
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212 }
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213 }
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diff changeset
214 result.put(flag, list.toArray(new Register[list.size()]));
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215 }
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diff changeset
216 return result;
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diff changeset
217 }
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218
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diff changeset
219 /**
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220 * Gets the maximum register {@linkplain #number number} in a given set of registers.
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diff changeset
221 *
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222 * @param registers the set of registers to process
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223 * @return the maximum register number for any register in {@code registers}
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parents:
diff changeset
224 */
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diff changeset
225 public static int maxRegisterNumber(Register[] registers) {
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226 int max = Integer.MIN_VALUE;
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diff changeset
227 for (Register r : registers) {
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diff changeset
228 if (r.number > max) {
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diff changeset
229 max = r.number;
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diff changeset
230 }
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parents:
diff changeset
231 }
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parents:
diff changeset
232 return max;
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parents:
diff changeset
233 }
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parents:
diff changeset
234
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
235 /**
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parents:
diff changeset
236 * Gets the maximum register {@linkplain #encoding encoding} in a given set of registers.
7530
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diff changeset
237 *
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diff changeset
238 * @param registers the set of registers to process
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parents:
diff changeset
239 * @return the maximum register encoding for any register in {@code registers}
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parents:
diff changeset
240 */
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diff changeset
241 public static int maxRegisterEncoding(Register[] registers) {
3733
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diff changeset
242 int max = Integer.MIN_VALUE;
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diff changeset
243 for (Register r : registers) {
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parents:
diff changeset
244 if (r.encoding > max) {
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parents:
diff changeset
245 max = r.encoding;
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parents:
diff changeset
246 }
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parents:
diff changeset
247 }
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parents:
diff changeset
248 return max;
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parents:
diff changeset
249 }
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parents:
diff changeset
250
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
251 @Override
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parents:
diff changeset
252 public String toString() {
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parents:
diff changeset
253 return name;
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parents:
diff changeset
254 }
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parents:
diff changeset
255
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parents:
diff changeset
256 @Override
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diff changeset
257 public int compareTo(Register o) {
3733
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parents:
diff changeset
258 if (number < o.number) {
e233f5660da4 Added Java files from Maxine project.
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parents:
diff changeset
259 return -1;
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parents:
diff changeset
260 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
261 if (number > o.number) {
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parents:
diff changeset
262 return 1;
e233f5660da4 Added Java files from Maxine project.
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parents:
diff changeset
263 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
264 return 0;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
265 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
266
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parents:
diff changeset
267 }