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annotate graal/com.oracle.max.cri/src/com/oracle/max/cri/ci/CiAddress.java @ 5504:452f91ebdb54

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Moved RiKind to cri.ri package.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Thu, 07 Jun 2012 17:09:57 +0200
parents 438ab53efdd0
children 56860d3f9f39
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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 import com.oracle.max.cri.ri.*;
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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 register, an index register,
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31 * a displacement and a scale. Note that the base and index registers may be a variable that will get a register assigned
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32 * later by the register allocator.
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33 */
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34 public final class CiAddress extends CiValue {
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35 private static final long serialVersionUID = -1003772042519945089L;
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36
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37 /**
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38 * A sentinel value used as a place holder in an instruction stream for an address that will be patched.
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39 */
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40 public static final CiAddress Placeholder = new CiAddress(RiKind.Illegal, CiValue.IllegalValue);
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41
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42 /**
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43 * Base register that defines the start of the address computation.
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44 * If not present, is denoted by {@link CiValue#IllegalValue}.
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45 */
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46 public CiValue base;
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47
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48 /**
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49 * Index register, the value of which (possibly scaled by {@link #scale}) is added to {@link #base}.
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50 * If not present, is denoted by {@link CiValue#IllegalValue}.
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51 */
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52 public CiValue index;
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53
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54 /**
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55 * Scaling factor for indexing, dependent on target operand size.
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56 */
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57 public final Scale scale;
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58
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59 /**
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60 * Optional additive displacement.
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61 */
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62 public final int displacement;
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63
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64 /**
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65 * Creates a {@code CiAddress} with given base register, no scaling and no displacement.
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66 * @param kind the kind of the value being addressed
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67 * @param base the base register
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68 */
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69 public CiAddress(RiKind kind, CiValue base) {
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70 this(kind, base, IllegalValue, Scale.Times1, 0);
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71 }
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72
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73 /**
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74 * Creates a {@code CiAddress} with given base register, no scaling and a given displacement.
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75 * @param kind the kind of the value being addressed
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76 * @param base the base register
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77 * @param displacement the displacement
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78 */
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79 public CiAddress(RiKind kind, CiValue base, int displacement) {
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80 this(kind, base, IllegalValue, Scale.Times1, displacement);
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81 }
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82
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83 /**
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84 * Creates a {@code CiAddress} with given base and index registers, scaling and displacement.
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85 * This is the most general constructor..
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86 * @param kind the kind of the value being addressed
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87 * @param base the base register
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88 * @param index the index register
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89 * @param scale the scaling factor
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90 * @param displacement the displacement
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91 */
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92 public CiAddress(RiKind kind, CiValue base, CiValue index, Scale scale, int displacement) {
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93 super(kind);
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94 this.base = base;
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95 this.index = index;
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96 this.scale = scale;
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97 this.displacement = displacement;
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98
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99 assert !isConstant(base) && !isStackSlot(base);
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100 assert !isConstant(index) && !isStackSlot(index);
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101 }
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102
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103 /**
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104 * A scaling factor used in complex addressing modes such as those supported by x86 platforms.
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105 */
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106 public enum Scale {
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107 Times1(1, 0),
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108 Times2(2, 1),
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109 Times4(4, 2),
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110 Times8(8, 3);
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111
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112 private Scale(int value, int log2) {
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113 this.value = value;
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114 this.log2 = log2;
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115 }
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116
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117 /**
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118 * The value (or multiplier) of this scale.
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119 */
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120 public final int value;
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121
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122 /**
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123 * The {@linkplain #value value} of this scale log 2.
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124 */
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125 public final int log2;
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126
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127 public static Scale fromInt(int scale) {
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128 switch (scale) {
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129 case 1: return Times1;
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130 case 2: return Times2;
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131 case 4: return Times4;
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132 case 8: return Times8;
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133 default: throw new IllegalArgumentException(String.valueOf(scale));
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134 }
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135 }
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136 }
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137
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138 @Override
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139 public String toString() {
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140 if (this == Placeholder) {
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141 return "[<placeholder>]";
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142 }
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143
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144 StringBuilder s = new StringBuilder();
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145 s.append(kind.javaName).append("[");
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146 String sep = "";
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147 if (isLegal(base)) {
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148 s.append(base);
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149 sep = " + ";
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150 }
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151 if (isLegal(index)) {
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152 s.append(sep).append(index).append(" * ").append(scale.value);
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153 sep = " + ";
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154 }
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155 if (displacement < 0) {
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156 s.append(" - ").append(-displacement);
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157 } else if (displacement > 0) {
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158 s.append(sep).append(displacement);
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159 }
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160 s.append("]");
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161 return s.toString();
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162 }
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163
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164 @Override
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165 public boolean equals(Object obj) {
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166 if (obj instanceof CiAddress) {
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167 CiAddress addr = (CiAddress) obj;
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168 return kind == addr.kind && displacement == addr.displacement && base.equals(addr.base) && scale == addr.scale && index.equals(addr.index);
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169 }
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170 return false;
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171 }
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172
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173 @Override
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174 public int hashCode() {
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175 return base.hashCode() ^ index.hashCode() ^ (displacement << 4) ^ (scale.value << 8) ^ (kind.ordinal() << 12);
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176 }
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177 }