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annotate graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/Constant.java @ 7103:0c59b76e6689

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Eliminate bogus conversion that Constant.asLong() performed; simplify asXxx methods so that they do not have control flow.
author Christian Wimmer <christian.wimmer@oracle.com>
date Thu, 29 Nov 2012 15:05:39 -0800
parents e23980f4a890
children f1f32b695d1e
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1 /*
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2 * Copyright (c) 2009, 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.graal.api.meta;
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24
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25 /**
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26 * Represents a constant (boxed) value, such as an integer, floating point number, or object reference, within the
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27 * compiler and across the compiler/runtime interface. Exports a set of {@code Constant} instances that represent
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28 * frequently used constant values, such as {@link #NULL_OBJECT}.
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29 */
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30 public final class Constant extends Value {
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31
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32 private static final long serialVersionUID = -6355452536852663986L;
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33
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34 private static final Constant[] INT_CONSTANT_CACHE = new Constant[100];
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35 static {
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36 for (int i = 0; i < INT_CONSTANT_CACHE.length; ++i) {
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37 INT_CONSTANT_CACHE[i] = new Constant(Kind.Int, i);
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38 }
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39 }
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40
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41 public static final Constant NULL_OBJECT = new Constant(null);
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42 public static final Constant INT_MINUS_1 = new Constant(Kind.Int, -1);
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43 public static final Constant INT_0 = forInt(0);
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44 public static final Constant INT_1 = forInt(1);
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45 public static final Constant INT_2 = forInt(2);
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46 public static final Constant INT_3 = forInt(3);
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47 public static final Constant INT_4 = forInt(4);
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48 public static final Constant INT_5 = forInt(5);
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49 public static final Constant LONG_0 = new Constant(Kind.Long, 0L);
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50 public static final Constant LONG_1 = new Constant(Kind.Long, 1L);
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51 public static final Constant FLOAT_0 = new Constant(Kind.Float, Float.floatToRawIntBits(0.0F));
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52 public static final Constant FLOAT_1 = new Constant(Kind.Float, Float.floatToRawIntBits(1.0F));
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53 public static final Constant FLOAT_2 = new Constant(Kind.Float, Float.floatToRawIntBits(2.0F));
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54 public static final Constant DOUBLE_0 = new Constant(Kind.Double, Double.doubleToRawLongBits(0.0D));
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55 public static final Constant DOUBLE_1 = new Constant(Kind.Double, Double.doubleToRawLongBits(1.0D));
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56 public static final Constant TRUE = new Constant(Kind.Boolean, 1L);
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57 public static final Constant FALSE = new Constant(Kind.Boolean, 0L);
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58
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59 static {
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60 assert FLOAT_0 != forFloat(-0.0F) : "Constant for 0.0f must be different from -0.0f";
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61 assert DOUBLE_0 != forDouble(-0.0d) : "Constant for 0.0d must be different from -0.0d";
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62 assert NULL_OBJECT.isNull();
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63 }
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64
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65 /**
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66 * The boxed object value if {@code !kind.isObject()} otherwise the (possibly null)
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67 * {@link #getPrimitiveAnnotation() annotation} for a primitive value.
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68 */
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69 private final Object object;
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70
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71 /**
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72 * The boxed primitive value as a {@code long}. This is ignored iff {@code kind.isObject()}. For {@code float} and
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73 * {@code double} values, this value is the result of {@link Float#floatToRawIntBits(float)} and
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74 * {@link Double#doubleToRawLongBits(double)} respectively.
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75 */
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76 private final long primitive;
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77
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78 /**
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79 * Creates a constant represented by the specified object reference.
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80 * @param object the value of this constant
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81 */
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82 private Constant(Object object) {
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83 super(Kind.Object);
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84 this.object = object;
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85 this.primitive = 0L;
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86 }
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87
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88 /**
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89 * Creates a constant represented by the specified primitive.
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90 *
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91 * @param kind the type of this constant
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92 * @param primitive the value of this constant
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93 */
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94 public Constant(Kind kind, long primitive) {
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95 super(kind);
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96 assert kind != Kind.Object;
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97 this.object = null;
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98 this.primitive = primitive;
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99 }
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100
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101 /**
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102 * Creates an annotated primitive constant. An annotation enables a {@linkplain MetaAccessProvider provider} to
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103 * associate some extra semantic or debugging information with a primitive. An annotated primitive constant
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104 * is never {@linkplain #equals(Object) equal} to a non-annotated constant.
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105 *
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106 * @param kind the type of this constant
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107 * @param primitive the value of this constant
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108 * @param annotation an arbitrary non-null object
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109 */
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110 public Constant(Kind kind, long primitive, Object annotation) {
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111 super(kind);
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112 assert kind != Kind.Object;
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113 assert annotation != null;
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114 this.object = annotation;
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115 this.primitive = primitive;
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116 }
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118 /**
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119 * Checks whether this constant is non-null.
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120 *
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121 * @return {@code true} if this constant is a primitive, or an object constant that is not null
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122 */
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123 public boolean isNonNull() {
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124 return getKind() != Kind.Object || object != null;
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125 }
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126
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127 /**
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128 * Checks whether this constant is null.
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129 *
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130 * @return {@code true} if this constant is the null constant
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131 */
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132 public boolean isNull() {
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133 return getKind() == Kind.Object && object == null;
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134 }
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135
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136 /**
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137 * Checks whether this constant is the default value for its kind (null, 0, 0.0, false).
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138 *
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139 * @return {@code true} if this constant is the default value for its kind
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140 */
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141 public boolean isDefaultForKind() {
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142 return object == null && primitive == 0;
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143 }
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144
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145 @Override
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146 public String toString() {
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147 String annotationSuffix = "";
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148 if (getKind() != Kind.Object && getPrimitiveAnnotation() != null) {
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149 annotationSuffix = "{" + getPrimitiveAnnotation() + "}";
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150 }
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151 return getKind().getJavaName() + "[" + getKind().format(asBoxedValue()) + (getKind() != Kind.Object ? "|0x" + Long.toHexString(primitive) : "") + "]" + annotationSuffix;
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152 }
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153
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154 /**
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155 * Returns the value of this constant as a boxed Java value.
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156 *
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157 * @return the value of this constant
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158 */
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159 public Object asBoxedValue() {
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160 switch (getKind()) {
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161 case Byte:
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162 return (byte) asInt();
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163 case Boolean:
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164 return asInt() == 0 ? Boolean.FALSE : Boolean.TRUE;
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165 case Short:
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166 return (short) primitive;
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167 case Char:
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168 return (char) primitive;
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169 case Jsr:
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170 return (int) primitive;
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171 case Int:
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172 return (int) primitive;
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173 case Long:
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174 return primitive;
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175 case Float:
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176 return asFloat();
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177 case Double:
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178 return asDouble();
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179 case Object:
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180 return object;
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181 }
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182 throw new IllegalArgumentException();
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183 }
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184
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185 private boolean valueEqual(Constant other, boolean ignoreKind) {
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186 // must have equivalent kinds to be equal
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187 if (!ignoreKind && getKind() != other.getKind()) {
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188 return false;
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189 }
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190 if (getKind() == Kind.Object) {
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191 return object == other.object;
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192 }
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193 return primitive == other.primitive && getPrimitiveAnnotation() == other.getPrimitiveAnnotation();
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194 }
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195
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196 /**
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197 * Returns the primitive int value this constant represents. The constant must have a {@link Kind#getStackKind()} of
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198 * {@link Kind#Int}, or kind {@link Kind#Jsr}.
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199 *
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200 * @return the constant value
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201 */
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202 public int asInt() {
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203 assert getKind().getStackKind() == Kind.Int || getKind() == Kind.Jsr;
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204 return (int) primitive;
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205 }
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206
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207 /**
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208 * Returns the primitive boolean value this constant represents. The constant must have kind {@link Kind#Boolean}.
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209 *
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210 * @return the constant value
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211 */
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212 public boolean asBoolean() {
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213 assert getKind() == Kind.Boolean;
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214 return primitive != 0L;
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215 }
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216
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217 /**
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218 * Returns the primitive long value this constant represents. The constant must have kind {@link Kind#Long}, a
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219 * {@link Kind#getStackKind()} of {@link Kind#Int}, or kind {@link Kind#Jsr}.
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220 *
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221 * @return the constant value
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222 */
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223 public long asLong() {
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224 assert getKind() == Kind.Long || getKind().getStackKind() == Kind.Int || getKind() == Kind.Jsr;
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225 return primitive;
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226 }
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227
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228 /**
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229 * Returns the primitive float value this constant represents. The constant must have kind {@link Kind#Float}.
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230 *
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231 * @return the constant value
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232 */
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233 public float asFloat() {
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234 assert getKind() == Kind.Float;
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235 return Float.intBitsToFloat((int) primitive);
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236 }
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237
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238 /**
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239 * Returns the primitive double value this constant represents. The constant must have kind {@link Kind#Double}.
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240 *
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241 * @return the constant value
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242 */
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243 public double asDouble() {
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244 assert getKind() == Kind.Double;
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245 return Double.longBitsToDouble(primitive);
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246 }
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247
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248 /**
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249 * Returns the object reference this constant represents. The constant must have kind {@link Kind#Object}.
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250 *
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251 * @return the constant value
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252 */
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253 public Object asObject() {
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254 assert getKind() == Kind.Object;
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255 return object;
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256 }
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257
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258 /**
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259 * Gets the annotation (if any) associated with this constant.
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260 *
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261 * @return null if this constant is not primitive or has no annotation
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262 */
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263 public Object getPrimitiveAnnotation() {
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e23980f4a890 Cleanup of Kind class: remove isXxx methods
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diff changeset
264 return getKind() == Kind.Object ? null : object;
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265 }
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266
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267 /**
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268 * Computes the hashcode of this constant.
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269 *
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270 * @return a suitable hashcode for this constant
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271 */
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272 @Override
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273 public int hashCode() {
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274 if (getKind() == Kind.Object) {
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275 return System.identityHashCode(object);
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276 }
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277 return (int) primitive;
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278 }
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279
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280 /**
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281 * Checks whether this constant equals another object. This is only true if the other object is a constant that has
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diff changeset
282 * the same {@linkplain #getKind() kind}, value and {@link #getPrimitiveAnnotation() annotation}.
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283 *
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284 * @param o the object to compare equality
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285 * @return {@code true} if this constant is equivalent to the specified object
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286 */
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diff changeset
287 @Override
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288 public boolean equals(Object o) {
5538
e18ba36bfebc Renamed RiConstant => Constant.
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diff changeset
289 return o == this || o instanceof Constant && valueEqual((Constant) o, false);
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290 }
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291
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parents:
diff changeset
292 /**
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293 * Creates a boxed double constant.
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diff changeset
294 *
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295 * @param d the double value to box
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296 * @return a boxed copy of {@code value}
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297 */
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298 public static Constant forDouble(double d) {
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299 if (Double.compare(0.0D, d) == 0) {
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300 return DOUBLE_0;
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301 }
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diff changeset
302 if (Double.compare(d, 1.0D) == 0) {
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303 return DOUBLE_1;
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304 }
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diff changeset
305 return new Constant(Kind.Double, Double.doubleToRawLongBits(d));
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306 }
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307
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diff changeset
308 /**
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309 * Creates a boxed float constant.
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diff changeset
310 *
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311 * @param f the float value to box
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312 * @return a boxed copy of {@code value}
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313 */
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314 public static Constant forFloat(float f) {
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diff changeset
315 if (Float.compare(f, 0.0F) == 0) {
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316 return FLOAT_0;
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317 }
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diff changeset
318 if (Float.compare(f, 1.0F) == 0) {
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319 return FLOAT_1;
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320 }
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diff changeset
321 if (Float.compare(f, 2.0F) == 0) {
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diff changeset
322 return FLOAT_2;
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diff changeset
323 }
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a891c53a295b Renaming RiKind => Kind.
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diff changeset
324 return new Constant(Kind.Float, Float.floatToRawIntBits(f));
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diff changeset
325 }
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diff changeset
326
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parents:
diff changeset
327 /**
e233f5660da4 Added Java files from Maxine project.
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328 * Creates a boxed long constant.
6994
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diff changeset
329 *
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diff changeset
330 * @param i the long value to box
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diff changeset
331 * @return a boxed copy of {@code value}
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diff changeset
332 */
5538
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diff changeset
333 public static Constant forLong(long i) {
5540
a891c53a295b Renaming RiKind => Kind.
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diff changeset
334 return i == 0 ? LONG_0 : i == 1 ? LONG_1 : new Constant(Kind.Long, i);
3733
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335 }
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336
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diff changeset
337 /**
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diff changeset
338 * Creates a boxed integer constant.
6994
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diff changeset
339 *
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340 * @param i the integer value to box
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341 * @return a boxed copy of {@code value}
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diff changeset
342 */
5538
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diff changeset
343 public static Constant forInt(int i) {
3733
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diff changeset
344 if (i == -1) {
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diff changeset
345 return INT_MINUS_1;
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diff changeset
346 }
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diff changeset
347 if (i >= 0 && i < INT_CONSTANT_CACHE.length) {
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diff changeset
348 return INT_CONSTANT_CACHE[i];
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parents:
diff changeset
349 }
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a891c53a295b Renaming RiKind => Kind.
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diff changeset
350 return new Constant(Kind.Int, i);
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diff changeset
351 }
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diff changeset
352
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parents:
diff changeset
353 /**
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diff changeset
354 * Creates a boxed byte constant.
6994
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diff changeset
355 *
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diff changeset
356 * @param i the byte value to box
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parents:
diff changeset
357 * @return a boxed copy of {@code value}
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diff changeset
358 */
5538
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diff changeset
359 public static Constant forByte(byte i) {
5540
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diff changeset
360 return new Constant(Kind.Byte, i);
3733
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parents:
diff changeset
361 }
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parents:
diff changeset
362
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parents:
diff changeset
363 /**
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parents:
diff changeset
364 * Creates a boxed boolean constant.
6994
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diff changeset
365 *
3733
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diff changeset
366 * @param i the boolean value to box
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parents:
diff changeset
367 * @return a boxed copy of {@code value}
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parents:
diff changeset
368 */
5538
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diff changeset
369 public static Constant forBoolean(boolean i) {
3733
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parents:
diff changeset
370 return i ? TRUE : FALSE;
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parents:
diff changeset
371 }
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parents:
diff changeset
372
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parents:
diff changeset
373 /**
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parents:
diff changeset
374 * Creates a boxed char constant.
6994
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diff changeset
375 *
3733
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376 * @param i the char value to box
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parents:
diff changeset
377 * @return a boxed copy of {@code value}
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parents:
diff changeset
378 */
5538
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diff changeset
379 public static Constant forChar(char i) {
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a891c53a295b Renaming RiKind => Kind.
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380 return new Constant(Kind.Char, i);
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381 }
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382
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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383 /**
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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384 * Creates a boxed short constant.
6994
fd1c171d9969 removed Kind parameter from Constant constructor for an object constant
Doug Simon <doug.simon@oracle.com>
parents: 6708
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385 *
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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386 * @param i the short value to box
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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387 * @return a boxed copy of {@code value}
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388 */
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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389 public static Constant forShort(short i) {
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390 return new Constant(Kind.Short, i);
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391 }
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392
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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393 /**
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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394 * Creates a boxed address (jsr/ret address) constant.
6994
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Doug Simon <doug.simon@oracle.com>
parents: 6708
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395 *
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396 * @param i the address value to box
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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397 * @return a boxed copy of {@code value}
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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398 */
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 5507
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399 public static Constant forJsr(int i) {
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400 return new Constant(Kind.Jsr, i);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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401 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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402
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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403 /**
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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404 * Creates a boxed object constant.
6994
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Doug Simon <doug.simon@oracle.com>
parents: 6708
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405 *
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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406 * @param o the object value to box
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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407 * @return a boxed copy of {@code value}
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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408 */
5538
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 5507
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409 public static Constant forObject(Object o) {
3733
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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410 if (o == null) {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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411 return NULL_OBJECT;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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412 }
6994
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Doug Simon <doug.simon@oracle.com>
parents: 6708
diff changeset
413 return new Constant(o);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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414 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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415
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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416 /**
6539
2463eb24b644 Cleanup of Graal API: Rename methods so that it follows the getXxx naming convention and so that they are similar to the names of the java.lang.reflect classes. Remove unused methods.
Christian Wimmer <christian.wimmer@oracle.com>
parents: 6329
diff changeset
417 * Creates a boxed constant for the given kind from an Object. The object needs to be of the Java boxed type
2463eb24b644 Cleanup of Graal API: Rename methods so that it follows the getXxx naming convention and so that they are similar to the names of the java.lang.reflect classes. Remove unused methods.
Christian Wimmer <christian.wimmer@oracle.com>
parents: 6329
diff changeset
418 * corresponding to the kind.
6994
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Doug Simon <doug.simon@oracle.com>
parents: 6708
diff changeset
419 *
3733
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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420 * @param kind the kind of the constant to create
5774
a1db0ea58b53 Removed left over Ci* prefixed identifiers
Doug Simon <doug.simon@oracle.com>
parents: 5711
diff changeset
421 * @param value the Java boxed value: a {@link Byte} instance for {@link Kind#Byte}, etc.
3733
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parents:
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422 * @return the boxed copy of {@code value}
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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423 */
5540
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parents: 5539
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424 public static Constant forBoxed(Kind kind, Object value) {
3733
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parents:
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425 switch (kind) {
5428
6ec0857cdf46 added support for snippet templates which are snippet graphs specialized by binding a constant to at least one of the snippet's parameters
Doug Simon <doug.simon@oracle.com>
parents: 4199
diff changeset
426 case Boolean:
6ec0857cdf46 added support for snippet templates which are snippet graphs specialized by binding a constant to at least one of the snippet's parameters
Doug Simon <doug.simon@oracle.com>
parents: 4199
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427 return forBoolean((Boolean) value);
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428 case Byte:
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parents:
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429 return forByte((Byte) value);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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430 case Char:
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parents:
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431 return forChar((Character) value);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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432 case Short:
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parents:
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433 return forShort((Short) value);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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434 case Int:
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parents:
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435 return forInt((Integer) value);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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436 case Long:
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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437 return forLong((Long) value);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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438 case Float:
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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439 return forFloat((Float) value);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
440 case Double:
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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441 return forDouble((Double) value);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
442 case Object:
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parents:
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443 return forObject(value);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
444 default:
5572
8f9c9d372e31 small renaming and doc fixes
Lukas Stadler <lukas.stadler@jku.at>
parents: 5543
diff changeset
445 throw new RuntimeException("cannot create Constant for boxed " + kind + " value");
3733
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parents:
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446 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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447 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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448 }