Mercurial > hg > graal-compiler
annotate graal/com.oracle.graal.asm.amd64/src/com/oracle/graal/asm/amd64/AMD64Address.java @ 13134:6217f601e65d
Allow addresses with an arbitrary scale value; fix handling of unsigned int-to-long conversion
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Fri, 22 Nov 2013 12:19:16 -0800 |
parents | e92fdf3e1558 |
children | 8db6e76cb658 |
rev | line source |
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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.graal.asm.amd64; |
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24 |
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25 import com.oracle.graal.api.code.*; |
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26 |
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27 /** |
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28 * Represents an address in target machine memory, specified via some combination of a base |
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29 * register, an index register, a displacement and a scale. Note that the base and index registers |
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30 * may be a variable that will get a register assigned later by the register allocator. |
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31 */ |
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32 public final class AMD64Address extends AbstractAddress { |
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33 |
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34 private final Register base; |
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35 private final Register index; |
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36 private final Scale scale; |
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37 private final int displacement; |
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38 |
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39 /** |
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40 * Creates an {@link AMD64Address} with given base register, no scaling and no displacement. |
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41 * |
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42 * @param base the base register |
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43 */ |
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44 public AMD64Address(Register base) { |
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45 this(base, Register.None, Scale.Times1, 0); |
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46 } |
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47 |
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48 /** |
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49 * Creates an {@link AMD64Address} with given base register, no scaling and a given |
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50 * displacement. |
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51 * |
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52 * @param base the base register |
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53 * @param displacement the displacement |
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54 */ |
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55 public AMD64Address(Register base, int displacement) { |
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56 this(base, Register.None, Scale.Times1, displacement); |
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57 } |
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58 |
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59 /** |
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60 * Creates an {@link AMD64Address} with given base and index registers, scaling and |
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61 * displacement. This is the most general constructor. |
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62 * |
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63 * @param base the base register |
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64 * @param index the index register |
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65 * @param scale the scaling factor |
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66 * @param displacement the displacement |
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67 */ |
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68 public AMD64Address(Register base, Register index, Scale scale, int displacement) { |
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69 this.base = base; |
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70 this.index = index; |
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71 this.scale = scale; |
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72 this.displacement = displacement; |
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73 |
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74 assert scale != null; |
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75 } |
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76 |
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77 /** |
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78 * A scaling factor used in the SIB addressing mode. |
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79 */ |
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80 public enum Scale { |
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81 Times1(1, 0), Times2(2, 1), Times4(4, 2), Times8(8, 3); |
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82 |
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83 private Scale(int value, int log2) { |
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84 this.value = value; |
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85 this.log2 = log2; |
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86 } |
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87 |
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88 /** |
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89 * The value (or multiplier) of this scale. |
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90 */ |
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91 public final int value; |
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92 |
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93 /** |
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94 * The {@linkplain #value value} of this scale log 2. |
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95 */ |
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96 public final int log2; |
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97 |
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98 public static Scale fromInt(int scale) { |
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99 switch (scale) { |
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100 case 1: |
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101 return Times1; |
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102 case 2: |
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103 return Times2; |
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104 case 4: |
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105 return Times4; |
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106 case 8: |
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107 return Times8; |
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108 default: |
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109 return null; |
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110 } |
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111 } |
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112 } |
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113 |
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114 @Override |
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115 public String toString() { |
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116 StringBuilder s = new StringBuilder(); |
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117 s.append("["); |
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118 String sep = ""; |
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119 if (!getBase().equals(Register.None)) { |
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120 s.append(getBase()); |
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121 sep = " + "; |
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122 } |
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123 if (!getIndex().equals(Register.None)) { |
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124 s.append(sep).append(getIndex()).append(" * ").append(getScale().value); |
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125 sep = " + "; |
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126 } |
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127 if (getDisplacement() < 0) { |
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128 s.append(" - ").append(-getDisplacement()); |
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129 } else if (getDisplacement() > 0) { |
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130 s.append(sep).append(getDisplacement()); |
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131 } |
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132 s.append("]"); |
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133 return s.toString(); |
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134 } |
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135 |
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136 /** |
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137 * @return Base register that defines the start of the address computation. If not present, is |
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138 * denoted by {@link Register#None}. |
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139 */ |
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140 public Register getBase() { |
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141 return base; |
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142 } |
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143 |
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144 /** |
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145 * @return Index register, the value of which (possibly scaled by {@link #getScale}) is added to |
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146 * {@link #getBase}. If not present, is denoted by {@link Register#None}. |
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147 */ |
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148 public Register getIndex() { |
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149 return index; |
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150 } |
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151 |
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152 /** |
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153 * @return Scaling factor for indexing, dependent on target operand size. |
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154 */ |
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155 public Scale getScale() { |
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156 return scale; |
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157 } |
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158 |
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159 /** |
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160 * @return Optional additive displacement. |
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161 */ |
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162 public int getDisplacement() { |
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163 return displacement; |
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164 } |
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165 } |