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annotate graal/com.oracle.jvmci.asm.amd64/src/com/oracle/jvmci/asm/amd64/AMD64Address.java @ 21711:1c41d00e6b2f

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moved com.oracle.graal.bytecode to JVMCI namespace (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Wed, 03 Jun 2015 21:42:01 +0200
parents 6df25b1418be
children
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1 /*
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2 * Copyright (c) 2010, 2013, 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.jvmci.asm.amd64;
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24
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25 import com.oracle.jvmci.code.Register;
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26 import com.oracle.jvmci.code.AbstractAddress;
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27
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28 /**
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29 * Represents an address in target machine memory, specified via some combination of a base
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30 * register, an index register, a displacement and a scale. Note that the base and index registers
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31 * may be a variable that will get a register assigned later by the register allocator.
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32 */
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33 public final class AMD64Address extends AbstractAddress {
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34
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35 private final Register base;
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36 private final Register index;
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37 private final Scale scale;
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38 private final int displacement;
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39
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40 /**
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41 * Creates an {@link AMD64Address} with given base register, no scaling and no displacement.
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42 *
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43 * @param base the base register
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44 */
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45 public AMD64Address(Register base) {
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46 this(base, Register.None, Scale.Times1, 0);
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47 }
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48
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49 /**
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50 * Creates an {@link AMD64Address} with given base register, no scaling and a given
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51 * displacement.
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52 *
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53 * @param base the base register
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54 * @param displacement the displacement
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55 */
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56 public AMD64Address(Register base, int displacement) {
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57 this(base, Register.None, Scale.Times1, displacement);
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58 }
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59
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60 /**
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61 * Creates an {@link AMD64Address} with given base and index registers, scaling and
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62 * displacement. This is the most general constructor.
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63 *
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64 * @param base the base register
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65 * @param index the index register
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66 * @param scale the scaling factor
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67 * @param displacement the displacement
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68 */
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69 public AMD64Address(Register base, Register index, Scale scale, int displacement) {
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70 this.base = base;
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71 this.index = index;
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72 this.scale = scale;
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73 this.displacement = displacement;
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74
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75 assert scale != null;
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76 }
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77
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78 /**
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79 * A scaling factor used in the SIB addressing mode.
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80 */
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81 public enum Scale {
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82 Times1(1, 0),
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83 Times2(2, 1),
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84 Times4(4, 2),
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85 Times8(8, 3);
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86
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87 private Scale(int value, int log2) {
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88 this.value = value;
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89 this.log2 = log2;
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90 }
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91
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92 /**
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93 * The value (or multiplier) of this scale.
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94 */
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95 public final int value;
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96
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97 /**
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98 * The {@linkplain #value value} of this scale log 2.
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99 */
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100 public final int log2;
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101
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102 public static Scale fromInt(int scale) {
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103 switch (scale) {
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104 case 1:
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105 return Times1;
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106 case 2:
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107 return Times2;
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108 case 4:
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109 return Times4;
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110 case 8:
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111 return Times8;
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112 default:
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113 return null;
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114 }
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115 }
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116 }
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117
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118 @Override
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119 public String toString() {
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120 StringBuilder s = new StringBuilder();
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121 s.append("[");
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122 String sep = "";
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123 if (!getBase().equals(Register.None)) {
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124 s.append(getBase());
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125 sep = " + ";
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126 }
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127 if (!getIndex().equals(Register.None)) {
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128 s.append(sep).append(getIndex()).append(" * ").append(getScale().value);
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129 sep = " + ";
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130 }
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131 if (getDisplacement() < 0) {
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132 s.append(" - ").append(-getDisplacement());
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133 } else if (getDisplacement() > 0) {
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134 s.append(sep).append(getDisplacement());
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135 }
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136 s.append("]");
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137 return s.toString();
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138 }
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139
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140 /**
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141 * @return Base register that defines the start of the address computation. If not present, is
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142 * denoted by {@link Register#None}.
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143 */
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144 public Register getBase() {
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145 return base;
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146 }
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147
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148 /**
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149 * @return Index register, the value of which (possibly scaled by {@link #getScale}) is added to
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150 * {@link #getBase}. If not present, is denoted by {@link Register#None}.
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151 */
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152 public Register getIndex() {
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153 return index;
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154 }
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155
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156 /**
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157 * @return Scaling factor for indexing, dependent on target operand size.
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158 */
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159 public Scale getScale() {
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160 return scale;
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161 }
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162
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163 /**
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164 * @return Optional additive displacement.
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165 */
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166 public int getDisplacement() {
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167 return displacement;
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168 }
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169 }