Mercurial > hg > truffle
annotate graal/com.oracle.max.cri/src/com/oracle/max/cri/ci/CiAddress.java @ 4266:e2499e6d8aa7
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author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Wed, 11 Jan 2012 16:31:46 +0100 |
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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.max.cri.ci; |
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24 |
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25 import static com.oracle.max.cri.ci.CiValueUtil.*; |
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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 register, an index register, |
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29 * a displacement and a scale. Note that the base and index registers may be {@link CiVariable variable}, that is as yet |
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30 * unassigned to target machine registers. |
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31 */ |
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32 public final class CiAddress extends CiValue { |
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33 private static final long serialVersionUID = -1003772042519945089L; |
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34 |
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35 /** |
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36 * A sentinel value used as a place holder in an instruction stream for an address that will be patched. |
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37 */ |
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38 public static final CiAddress Placeholder = new CiAddress(CiKind.Illegal, CiValue.IllegalValue); |
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39 |
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40 /** |
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41 * Base register that defines the start of the address computation; always present. |
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42 */ |
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43 public final CiValue base; |
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44 /** |
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45 * Optional index register, the value of which (possibly scaled by {@link #scale}) is added to {@link #base}. |
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46 * If not present, is denoted by {@link CiValue#IllegalValue}. |
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47 */ |
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48 public final CiValue index; |
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49 /** |
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50 * Scaling factor for indexing, dependent on target operand size. |
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51 */ |
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52 public final Scale scale; |
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53 /** |
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54 * Optional additive displacement. |
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55 */ |
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56 public final int displacement; |
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57 |
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58 /** |
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59 * Creates a {@code CiAddress} with given base register, no scaling and no displacement. |
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60 * @param kind the kind of the value being addressed |
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61 * @param base the base register |
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62 */ |
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63 public CiAddress(CiKind kind, CiValue base) { |
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64 this(kind, base, IllegalValue, Scale.Times1, 0); |
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65 } |
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66 |
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67 /** |
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68 * Creates a {@code CiAddress} with given base register, no scaling and a given displacement. |
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69 * @param kind the kind of the value being addressed |
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70 * @param base the base register |
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71 * @param displacement the displacement |
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72 */ |
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73 public CiAddress(CiKind kind, CiValue base, int displacement) { |
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74 this(kind, base, IllegalValue, Scale.Times1, displacement); |
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75 } |
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76 |
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77 /** |
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78 * Creates a {@code CiAddress} with given base and offset registers, no scaling and no displacement. |
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79 * @param kind the kind of the value being addressed |
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80 * @param base the base register |
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81 * @param offset the offset register |
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82 */ |
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83 public CiAddress(CiKind kind, CiValue base, CiValue offset) { |
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84 this(kind, base, offset, Scale.Times1, 0); |
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85 } |
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86 |
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87 /** |
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88 * Creates a {@code CiAddress} with given base and index registers, scaling and displacement. |
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89 * This is the most general constructor.. |
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90 * @param kind the kind of the value being addressed |
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91 * @param base the base register |
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92 * @param index the index register |
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93 * @param scale the scaling factor |
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94 * @param displacement the displacement |
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95 */ |
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96 public CiAddress(CiKind kind, CiValue base, CiValue index, Scale scale, int displacement) { |
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97 super(kind); |
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98 |
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99 this.base = base; |
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100 if (isConstant(index)) { |
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101 long longIndex = ((CiConstant) index).asLong(); |
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102 long longDisp = displacement + longIndex * scale.value; |
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103 if ((int) longIndex != longIndex || (int) longDisp != longDisp) { |
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104 throw new Error("integer overflow when computing constant displacement"); |
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105 } |
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106 this.displacement = (int) longDisp; |
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107 this.index = IllegalValue; |
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108 this.scale = Scale.Times1; |
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109 } else { |
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110 this.index = index; |
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111 this.scale = scale; |
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112 this.displacement = displacement; |
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113 } |
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114 } |
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115 |
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116 /** |
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117 * A scaling factor used in complex addressing modes such as those supported by x86 platforms. |
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118 */ |
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119 public enum Scale { |
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120 Times1(1, 0), |
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121 Times2(2, 1), |
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122 Times4(4, 2), |
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123 Times8(8, 3); |
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124 |
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125 Scale(int value, int log2) { |
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126 this.value = value; |
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127 this.log2 = log2; |
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128 } |
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129 |
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130 /** |
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131 * The value (or multiplier) of this scale. |
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132 */ |
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133 public final int value; |
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134 |
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135 /** |
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136 * The {@linkplain #value value} of this scale log 2. |
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137 */ |
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138 public final int log2; |
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139 |
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140 public static Scale fromInt(int scale) { |
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141 // Checkstyle: stop |
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142 switch (scale) { |
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143 case 1: return Times1; |
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144 case 2: return Times2; |
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145 case 4: return Times4; |
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146 case 8: return Times8; |
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147 default: throw new IllegalArgumentException(String.valueOf(scale)); |
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148 } |
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149 // Checkstyle: resume |
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150 } |
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151 |
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152 public static Scale fromShift(int shift) { |
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153 return fromInt(1 << shift); |
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154 } |
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155 } |
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156 |
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157 /** |
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158 * Encodes the possible addressing modes as a simple value. |
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159 */ |
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160 public enum Format { |
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161 BASE, |
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162 BASE_DISP, |
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163 BASE_INDEX, |
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164 BASE_INDEX_DISP, |
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165 PLACEHOLDER; |
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166 } |
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167 |
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168 /** |
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169 * Returns the {@link Format encoded addressing mode} that this {@code CiAddress} represents. |
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170 * @return the encoded addressing mode |
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171 */ |
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172 public Format format() { |
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173 if (this == Placeholder) { |
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174 return Format.PLACEHOLDER; |
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175 } |
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176 assert isLegal(base); |
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177 if (isLegal(index)) { |
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178 if (displacement != 0) { |
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179 return Format.BASE_INDEX_DISP; |
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180 } else { |
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181 return Format.BASE_INDEX; |
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182 } |
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183 } else { |
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184 if (displacement != 0) { |
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185 return Format.BASE_DISP; |
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186 } else { |
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187 return Format.BASE; |
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188 } |
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189 } |
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190 } |
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191 |
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192 private static String signed(int i) { |
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193 if (i >= 0) { |
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194 return "+" + i; |
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195 } |
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196 return String.valueOf(i); |
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197 } |
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198 |
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199 @Override |
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200 public String toString() { |
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201 // Checkstyle: stop |
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202 switch (format()) { |
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203 case BASE : return "[" + base + kindSuffix() + "]"; |
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204 case BASE_DISP : return "[" + base + signed(displacement) + kindSuffix() + "]"; |
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205 case BASE_INDEX : return "[" + base + "+" + index + kindSuffix() + "]"; |
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206 case BASE_INDEX_DISP : return "[" + base + "+(" + index + "*" + scale.value + ")" + signed(displacement) + kindSuffix() + "]"; |
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207 case PLACEHOLDER : return "[<placeholder>]"; |
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208 default : throw new IllegalArgumentException("unknown format: " + format()); |
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209 } |
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210 // Checkstyle: resume |
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211 } |
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212 |
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213 @Override |
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214 public boolean equals(Object obj) { |
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215 if (obj instanceof CiAddress) { |
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216 CiAddress addr = (CiAddress) obj; |
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217 return kind == addr.kind && displacement == addr.displacement && base.equals(addr.base) && scale == addr.scale && index.equals(addr.index); |
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218 } |
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219 return false; |
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220 } |
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221 |
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|
222 @Override |
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223 public int hashCode() { |
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224 return (base.hashCode() << 4) | kind.ordinal(); |
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225 } |
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226 } |