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annotate graal/com.oracle.max.cri/src/com/oracle/max/cri/ci/CiAddress.java @ 4206:430b5db3e6f8

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Remove CiVariable from the CRI
author Christian Wimmer <Christian.Wimmer@Oracle.com>
date Tue, 03 Jan 2012 12:10:27 -0800
parents aaac4894175c
children 9ce8594bedaf
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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
4169
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200 public String toString() {
3733
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201 // Checkstyle: stop
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202 switch (format()) {
4206
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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() + "]";
3733
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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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diff changeset
222 @Override
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223 public int hashCode() {
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diff changeset
224 return (base.hashCode() << 4) | kind.ordinal();
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225 }
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226 }