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annotate graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/Address.java @ 7530:5e3d1a68664e

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applied mx eclipseformat to all Java files
author Doug Simon <doug.simon@oracle.com>
date Wed, 23 Jan 2013 16:34:57 +0100
parents 2463eb24b644
children 838293a77af7
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1 /*
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2 * Copyright (c) 2010, 2012, 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 static com.oracle.graal.api.code.ValueUtil.*;
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26
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27 import com.oracle.graal.api.meta.*;
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28
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29 /**
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30 * Represents an address in target machine memory, specified via some combination of a base
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31 * register, an index register, a displacement and a scale. Note that the base and index registers
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32 * may be a variable that will get a register assigned later by the register allocator.
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33 */
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34 public final class Address extends Value {
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35
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36 private static final long serialVersionUID = -1003772042519945089L;
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37
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38 /**
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39 * A sentinel value used as a place holder in an instruction stream for an address that will be
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40 * patched.
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41 */
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42 public static final Address Placeholder = new Address(Kind.Illegal, Value.ILLEGAL);
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43
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44 private Value base;
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45 private Value index;
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46 private final Scale scale;
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47 private final int displacement;
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48
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49 /**
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50 * Creates an {@link Address} with given base register, no scaling and no displacement.
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51 *
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52 * @param kind the kind of the value being addressed
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53 * @param base the base register
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54 */
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55 public Address(Kind kind, Value base) {
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56 this(kind, base, ILLEGAL, Scale.Times1, 0);
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57 }
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58
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59 /**
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60 * Creates an {@link Address} with given base register, no scaling and a given displacement.
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61 *
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62 * @param kind the kind of the value being addressed
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63 * @param base the base register
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64 * @param displacement the displacement
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65 */
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66 public Address(Kind kind, Value base, int displacement) {
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67 this(kind, base, ILLEGAL, Scale.Times1, displacement);
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68 }
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69
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70 /**
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71 * Creates an {@link Address} with given base and index registers, scaling and displacement.
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72 * This is the most general constructor.
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73 *
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74 * @param kind the kind of the value being addressed
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75 * @param base the base register
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76 * @param index the index register
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77 * @param scale the scaling factor
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78 * @param displacement the displacement
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79 */
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80 public Address(Kind kind, Value base, Value index, Scale scale, int displacement) {
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81 super(kind);
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82 this.setBase(base);
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83 this.setIndex(index);
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84 this.scale = scale;
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85 this.displacement = displacement;
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86
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87 assert !isConstant(base) && !isStackSlot(base);
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88 assert !isConstant(index) && !isStackSlot(index);
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89 }
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90
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91 /**
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92 * A scaling factor used in complex addressing modes such as those supported by x86 platforms.
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93 */
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94 public enum Scale {
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95 Times1(1, 0), Times2(2, 1), Times4(4, 2), Times8(8, 3);
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96
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97 private Scale(int value, int log2) {
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98 this.value = value;
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99 this.log2 = log2;
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100 }
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101
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102 /**
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103 * The value (or multiplier) of this scale.
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104 */
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105 public final int value;
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106
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107 /**
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108 * The {@linkplain #value value} of this scale log 2.
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109 */
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110 public final int log2;
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111
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112 public static Scale fromInt(int scale) {
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113 switch (scale) {
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114 case 1:
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115 return Times1;
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116 case 2:
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117 return Times2;
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118 case 4:
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119 return Times4;
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120 case 8:
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121 return Times8;
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122 default:
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123 throw new IllegalArgumentException(String.valueOf(scale));
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124 }
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125 }
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126 }
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127
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128 @Override
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129 public String toString() {
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130 if (this == Placeholder) {
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131 return "[<placeholder>]";
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132 }
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133
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134 StringBuilder s = new StringBuilder();
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135 s.append(getKind().getJavaName()).append("[");
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136 String sep = "";
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137 if (isLegal(getBase())) {
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138 s.append(getBase());
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139 sep = " + ";
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140 }
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141 if (isLegal(getIndex())) {
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142 s.append(sep).append(getIndex()).append(" * ").append(getScale().value);
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143 sep = " + ";
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144 }
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145 if (getDisplacement() < 0) {
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146 s.append(" - ").append(-getDisplacement());
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147 } else if (getDisplacement() > 0) {
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148 s.append(sep).append(getDisplacement());
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149 }
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150 s.append("]");
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151 return s.toString();
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152 }
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153
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154 @Override
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155 public boolean equals(Object obj) {
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156 if (obj instanceof Address) {
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157 Address addr = (Address) obj;
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158 return getKind() == addr.getKind() && getDisplacement() == addr.getDisplacement() && getBase().equals(addr.getBase()) && getScale() == addr.getScale() &&
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159 getIndex().equals(addr.getIndex());
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160 }
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161 return false;
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162 }
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163
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164 @Override
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165 public int hashCode() {
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166 return getBase().hashCode() ^ getIndex().hashCode() ^ (getDisplacement() << 4) ^ (getScale().value << 8) ^ (getKind().ordinal() << 12);
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167 }
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168
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169 /**
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170 * @return Base register that defines the start of the address computation. If not present, is
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171 * denoted by {@link Value#ILLEGAL}.
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172 */
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173 public Value getBase() {
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174 return base;
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175 }
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176
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177 public void setBase(Value base) {
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178 this.base = base;
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179 }
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180
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181 /**
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182 * @return Index register, the value of which (possibly scaled by {@link #scale}) is added to
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183 * {@link #base}. If not present, is denoted by {@link Value#ILLEGAL}.
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184 */
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185 public Value getIndex() {
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186 return index;
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187 }
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188
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189 public void setIndex(Value index) {
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190 this.index = index;
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191 }
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192
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193 /**
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194 * @return Scaling factor for indexing, dependent on target operand size.
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195 */
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196 public Scale getScale() {
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197 return scale;
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198 }
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199
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200 /**
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201 * @return Optional additive displacement.
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202 */
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203 public int getDisplacement() {
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204 return displacement;
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205 }
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206 }