Mercurial > hg > graal-compiler
annotate graal/com.oracle.jvmci.asm.amd64/src/com/oracle/jvmci/asm/amd64/AMD64Address.java @ 21708:6df25b1418be
moved com.oracle.asm.** to jvmci-util.jar (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
---|---|
date | Wed, 03 Jun 2015 18:06:44 +0200 |
parents | graal/com.oracle.graal.asm.amd64/src/com/oracle/graal/asm/amd64/AMD64Address.java@48c1ebd24120 |
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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 } |