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annotate graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/LIRKind.java @ 19411:b029f5244371

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author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Mon, 16 Feb 2015 18:08:55 +0100
parents c88ab4f1f04a
children a4b60873851b
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1 /*
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2 * Copyright (c) 2014, 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.api.meta;
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24
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25 /**
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26 * Represents the type of values in the LIR. It is composed of a {@link PlatformKind} that gives the
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27 * low level representation of the value, and a {@link #referenceMask} that describes the location
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28 * of object references in the value.
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29 *
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30 * <h2>Constructing {@link LIRKind} instances</h2>
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31 *
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32 * During LIR generation, every new {@link Value} should get a {@link LIRKind} of the correct
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33 * {@link PlatformKind} that also contains the correct reference information. {@linkplain LIRKind
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34 * LIRKinds} should be created as follows:
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35 *
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36 * <p>
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37 * If the result value is created from one or more input values, the {@link LIRKind} should be
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38 * created with {@link LIRKind#derive}(inputs). If the result has a different {@link PlatformKind}
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39 * than the inputs, {@link LIRKind#derive}(inputs).{@link #changeType}(resultKind) should be used.
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40 * <p>
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41 * If the result is an exact copy of one of the inputs, {@link Value#getLIRKind()} can be used. Note
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42 * that this is only correct for move-like operations, like conditional move or compare-and-swap.
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43 * For convert operations, {@link LIRKind#derive} should be used.
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44 * <p>
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45 * If it is known that the result will be a reference (e.g. pointer arithmetic where the end result
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46 * is a valid oop), {@link LIRKind#reference} should be used.
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47 * <p>
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48 * If it is known that the result will neither be a reference nor be derived from a reference,
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49 * {@link LIRKind#value} can be used. If the operation producing this value has inputs, this is very
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50 * likely wrong, and {@link LIRKind#derive} should be used instead.
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51 * <p>
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52 * If it is known that the result is derived from a reference, {@link LIRKind#derivedReference} can
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53 * be used. In most cases, {@link LIRKind#derive} should be used instead, since it is able to detect
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54 * this automatically.
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55 */
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56 public final class LIRKind {
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57
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58 /**
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59 * The non-type. This uses {@link #derivedReference}, so it can never be part of an oop map.
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60 */
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61 public static final LIRKind Illegal = derivedReference(Kind.Illegal);
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62
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63 private final PlatformKind platformKind;
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64 private final int referenceMask;
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65
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66 private static final int DERIVED_REFERENCE = -1;
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67
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68 private LIRKind(PlatformKind platformKind, int referenceMask) {
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69 this.platformKind = platformKind;
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70 this.referenceMask = referenceMask;
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71 }
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72
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73 /**
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74 * Create a {@link LIRKind} of type {@code platformKind} that contains a primitive value. Should
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75 * be only used when it's guaranteed that the value is not even indirectly derived from a
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76 * reference. Otherwise, {@link #derive(Value...)} should be used instead.
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77 */
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78 public static LIRKind value(PlatformKind platformKind) {
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79 assert platformKind != Kind.Object : "Object should always be used as reference type";
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80 return new LIRKind(platformKind, 0);
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81 }
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82
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83 /**
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84 * Create a {@link LIRKind} of type {@code platformKind} that contains a single tracked oop
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85 * reference.
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86 */
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87 public static LIRKind reference(PlatformKind platformKind) {
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88 int length = platformKind.getVectorLength();
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89 assert 0 < length && length < 32 : "vector of " + length + " references not supported";
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90 return new LIRKind(platformKind, (1 << length) - 1);
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91 }
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92
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93 /**
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94 * Create a {@link LIRKind} of type {@code platformKind} that contains a value that is derived
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95 * from a reference. Values of this {@link LIRKind} can not be live at safepoints. In most
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96 * cases, this should not be called directly. {@link #derive} should be used instead to
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97 * automatically propagate this information.
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98 */
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99 public static LIRKind derivedReference(PlatformKind platformKind) {
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100 return new LIRKind(platformKind, DERIVED_REFERENCE);
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101 }
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102
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103 /**
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104 * Derive a new type from inputs. The result will have the {@link PlatformKind} of one of the
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105 * inputs. If all inputs are values, the result is a value. Otherwise, the result is a derived
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106 * reference.
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107 *
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108 * This method should be used to construct the result {@link LIRKind} of any operation that
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109 * modifies values (e.g. arithmetics).
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110 */
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111 public static LIRKind derive(Value... inputs) {
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112 assert inputs.length > 0;
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113 for (Value input : inputs) {
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114 LIRKind kind = input.getLIRKind();
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115 if (kind.isDerivedReference()) {
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116 return kind;
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117 } else if (!kind.isValue()) {
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118 return kind.makeDerivedReference();
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119 }
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120 }
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121
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122 // all inputs are values, just return one of them
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123 return inputs[0].getLIRKind();
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124 }
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125
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126 /**
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127 * Create a new {@link LIRKind} with the same reference information and a new
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128 * {@linkplain #getPlatformKind platform kind}. If the new kind is a longer vector than this,
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129 * the new elements are marked as untracked values.
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130 */
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131 public LIRKind changeType(PlatformKind newPlatformKind) {
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132 if (newPlatformKind == platformKind) {
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133 return this;
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134 } else if (isDerivedReference()) {
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135 return derivedReference(newPlatformKind);
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136 } else if (referenceMask == 0) {
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137 // value type
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138 return new LIRKind(newPlatformKind, 0);
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139 } else {
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140 // reference type
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141 int newLength = Math.min(32, newPlatformKind.getVectorLength());
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142 int newReferenceMask = referenceMask & (0xFFFFFFFF >>> (32 - newLength));
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143 assert newReferenceMask != DERIVED_REFERENCE;
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144 return new LIRKind(newPlatformKind, newReferenceMask);
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145 }
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146 }
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147
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148 /**
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149 * Create a new {@link LIRKind} with a new {@linkplain #getPlatformKind platform kind}. If the
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150 * new kind is longer than this, the reference positions are repeated to fill the vector.
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151 */
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152 public LIRKind repeat(PlatformKind newPlatformKind) {
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153 if (isDerivedReference()) {
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154 return derivedReference(newPlatformKind);
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155 } else if (referenceMask == 0) {
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156 // value type
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157 return new LIRKind(newPlatformKind, 0);
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158 } else {
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159 // reference type
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160 int oldLength = platformKind.getVectorLength();
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161 int newLength = newPlatformKind.getVectorLength();
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162 assert oldLength <= newLength && newLength < 32 && (newLength % oldLength) == 0;
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163
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164 // repeat reference mask to fill new kind
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165 int newReferenceMask = 0;
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166 for (int i = 0; i < newLength; i += platformKind.getVectorLength()) {
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167 newReferenceMask |= referenceMask << i;
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168 }
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169
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170 assert newReferenceMask != DERIVED_REFERENCE;
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171 return new LIRKind(newPlatformKind, newReferenceMask);
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172 }
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173 }
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174
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175 /**
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176 * Create a new {@link LIRKind} with the same type, but marked as containing a derivedReference.
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177 */
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178 public LIRKind makeDerivedReference() {
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179 return new LIRKind(platformKind, DERIVED_REFERENCE);
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180 }
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181
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182 /**
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183 * Get the low level type that is used in code generation.
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184 */
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185 public PlatformKind getPlatformKind() {
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186 return platformKind;
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187 }
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188
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189 /**
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190 * Check whether this value is derived from a reference. If this returns {@code true}, this
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191 * value must not be live at safepoints.
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192 */
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193 public boolean isDerivedReference() {
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194 return referenceMask == DERIVED_REFERENCE;
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195 }
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196
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197 /**
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198 * Check whether the {@code idx}th part of this value is a reference that must be tracked at
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199 * safepoints.
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200 *
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201 * @param idx The index into the vector if this is a vector kind. Must be 0 if this is a scalar
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202 * kind.
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203 */
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204 public boolean isReference(int idx) {
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205 assert 0 <= idx && idx < platformKind.getVectorLength() : "invalid index " + idx + " in " + this;
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206 return !isDerivedReference() && (referenceMask & 1 << idx) != 0;
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207 }
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208
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209 /**
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210 * Check whether this kind is a value type that doesn't need to be tracked at safepoints.
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211 */
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212 public boolean isValue() {
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213 return referenceMask == 0;
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214 }
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215
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216 @Override
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217 public String toString() {
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218 if (isValue()) {
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219 return platformKind.name();
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220 } else if (isDerivedReference()) {
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221 return platformKind.name() + "[*]";
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222 } else {
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223 StringBuilder ret = new StringBuilder();
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224 ret.append(platformKind.name());
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225 ret.append('[');
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226 for (int i = 0; i < platformKind.getVectorLength(); i++) {
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227 if (isReference(i)) {
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228 ret.append('.');
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229 } else {
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230 ret.append(' ');
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231 }
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232 }
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233 ret.append(']');
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234 return ret.toString();
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235 }
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236 }
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237
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238 @Override
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239 public int hashCode() {
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240 final int prime = 31;
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241 int result = 1;
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242 result = prime * result + ((platformKind == null) ? 0 : platformKind.hashCode());
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243 result = prime * result + referenceMask;
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244 return result;
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245 }
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246
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247 @Override
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248 public boolean equals(Object obj) {
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249 if (this == obj) {
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250 return true;
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251 }
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252 if (!(obj instanceof LIRKind)) {
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253 return false;
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254 }
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255
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256 LIRKind other = (LIRKind) obj;
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257 return platformKind == other.platformKind && referenceMask == other.referenceMask;
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258 }
18163
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259 }