Mercurial > hg > graal-jvmci-8
annotate graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/Constant.java @ 15018:db4254246f9a
Remove Constant.forObject and Constant.asObject to improve compiler/VM separation
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Mon, 07 Apr 2014 16:09:17 -0700 |
parents | 82e4fe6fa525 |
children | b862cf4381ef |
rev | line source |
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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 |
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27 * reference, within the compiler and across the compiler/runtime interface. Exports a set of |
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28 * {@code Constant} instances that represent frequently used constant values, such as |
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29 * {@link #NULL_OBJECT}. |
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30 */ |
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31 public abstract class Constant extends Value { |
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32 |
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33 private static final long serialVersionUID = -6355452536852663986L; |
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34 |
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35 private static final Constant[] INT_CONSTANT_CACHE = new Constant[100]; |
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36 static { |
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37 for (int i = 0; i < INT_CONSTANT_CACHE.length; ++i) { |
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38 INT_CONSTANT_CACHE[i] = new PrimitiveConstant(Kind.Int, i); |
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39 } |
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40 } |
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41 |
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42 public static final Constant NULL_OBJECT = new NullConstant(); |
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43 public static final Constant INT_MINUS_1 = new PrimitiveConstant(Kind.Int, -1); |
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44 public static final Constant INT_0 = forInt(0); |
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45 public static final Constant INT_1 = forInt(1); |
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46 public static final Constant INT_2 = forInt(2); |
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47 public static final Constant INT_3 = forInt(3); |
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48 public static final Constant INT_4 = forInt(4); |
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49 public static final Constant INT_5 = forInt(5); |
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50 public static final Constant LONG_0 = new PrimitiveConstant(Kind.Long, 0L); |
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51 public static final Constant LONG_1 = new PrimitiveConstant(Kind.Long, 1L); |
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52 public static final Constant FLOAT_0 = new PrimitiveConstant(Kind.Float, Float.floatToRawIntBits(0.0F)); |
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53 public static final Constant FLOAT_1 = new PrimitiveConstant(Kind.Float, Float.floatToRawIntBits(1.0F)); |
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54 public static final Constant FLOAT_2 = new PrimitiveConstant(Kind.Float, Float.floatToRawIntBits(2.0F)); |
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55 public static final Constant DOUBLE_0 = new PrimitiveConstant(Kind.Double, Double.doubleToRawLongBits(0.0D)); |
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56 public static final Constant DOUBLE_1 = new PrimitiveConstant(Kind.Double, Double.doubleToRawLongBits(1.0D)); |
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57 public static final Constant TRUE = new PrimitiveConstant(Kind.Boolean, 1L); |
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58 public static final Constant FALSE = new PrimitiveConstant(Kind.Boolean, 0L); |
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59 |
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60 static { |
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61 assert FLOAT_0 != forFloat(-0.0F) : "Constant for 0.0f must be different from -0.0f"; |
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62 assert DOUBLE_0 != forDouble(-0.0d) : "Constant for 0.0d must be different from -0.0d"; |
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63 assert NULL_OBJECT.isNull(); |
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64 } |
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65 |
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66 protected Constant(Kind kind) { |
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67 super(kind); |
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68 } |
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69 |
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70 /** |
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71 * Checks whether this constant is null. |
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72 * |
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73 * @return {@code true} if this constant is the null constant |
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74 */ |
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75 public abstract boolean isNull(); |
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76 |
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77 /** |
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78 * Checks whether this constant is non-null. |
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79 * |
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80 * @return {@code true} if this constant is a primitive, or an object constant that is not null |
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81 */ |
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82 public final boolean isNonNull() { |
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83 return !isNull(); |
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84 } |
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85 |
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86 /** |
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87 * Checks whether this constant is the default value for its kind (null, 0, 0.0, false). |
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88 * |
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89 * @return {@code true} if this constant is the default value for its kind |
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90 */ |
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91 public abstract boolean isDefaultForKind(); |
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92 |
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93 /** |
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94 * Returns the value of this constant as a boxed Java value. |
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95 * |
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96 * @return the value of this constant |
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97 */ |
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98 public abstract Object asBoxedPrimitive(); |
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99 |
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100 /** |
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101 * Returns the primitive int value this constant represents. The constant must have a |
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102 * {@link Kind#getStackKind()} of {@link Kind#Int}. |
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103 * |
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104 * @return the constant value |
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105 */ |
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106 public abstract int asInt(); |
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107 |
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108 /** |
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109 * Returns the primitive boolean value this constant represents. The constant must have kind |
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110 * {@link Kind#Boolean}. |
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111 * |
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112 * @return the constant value |
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113 */ |
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114 public abstract boolean asBoolean(); |
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115 |
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116 /** |
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117 * Returns the primitive long value this constant represents. The constant must have kind |
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118 * {@link Kind#Long}, a {@link Kind#getStackKind()} of {@link Kind#Int}. |
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119 * |
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120 * @return the constant value |
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121 */ |
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122 public abstract long asLong(); |
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123 |
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124 /** |
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125 * Returns the primitive float value this constant represents. The constant must have kind |
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126 * {@link Kind#Float}. |
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127 * |
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128 * @return the constant value |
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129 */ |
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130 public abstract float asFloat(); |
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131 |
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132 /** |
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133 * Returns the primitive double value this constant represents. The constant must have kind |
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134 * {@link Kind#Double}. |
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135 * |
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136 * @return the constant value |
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137 */ |
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138 public abstract double asDouble(); |
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139 |
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140 public String toValueString() { |
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141 return getKind().format(asBoxedPrimitive()); |
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142 } |
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143 |
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144 @Override |
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145 public String toString() { |
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146 if (getKind() == Kind.Illegal) { |
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147 return "illegal"; |
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148 } else { |
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149 return getKind().getJavaName() + "[" + toValueString() + "]"; |
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150 } |
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151 } |
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152 |
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153 /** |
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154 * Creates a boxed double constant. |
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155 * |
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156 * @param d the double value to box |
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157 * @return a boxed copy of {@code value} |
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158 */ |
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159 public static Constant forDouble(double d) { |
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160 if (Double.compare(0.0D, d) == 0) { |
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161 return DOUBLE_0; |
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162 } |
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163 if (Double.compare(d, 1.0D) == 0) { |
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164 return DOUBLE_1; |
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165 } |
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166 return new PrimitiveConstant(Kind.Double, Double.doubleToRawLongBits(d)); |
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167 } |
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168 |
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169 /** |
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170 * Creates a boxed float constant. |
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171 * |
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172 * @param f the float value to box |
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173 * @return a boxed copy of {@code value} |
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174 */ |
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175 public static Constant forFloat(float f) { |
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176 if (Float.compare(f, 0.0F) == 0) { |
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177 return FLOAT_0; |
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178 } |
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179 if (Float.compare(f, 1.0F) == 0) { |
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180 return FLOAT_1; |
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181 } |
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182 if (Float.compare(f, 2.0F) == 0) { |
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183 return FLOAT_2; |
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184 } |
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185 return new PrimitiveConstant(Kind.Float, Float.floatToRawIntBits(f)); |
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186 } |
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187 |
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188 /** |
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189 * Creates a boxed long constant. |
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190 * |
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191 * @param i the long value to box |
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192 * @return a boxed copy of {@code value} |
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193 */ |
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194 public static Constant forLong(long i) { |
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195 return i == 0 ? LONG_0 : i == 1 ? LONG_1 : new PrimitiveConstant(Kind.Long, i); |
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196 } |
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197 |
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198 /** |
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199 * Creates a boxed integer constant. |
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200 * |
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201 * @param i the integer value to box |
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202 * @return a boxed copy of {@code value} |
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203 */ |
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204 public static Constant forInt(int i) { |
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205 if (i == -1) { |
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206 return INT_MINUS_1; |
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207 } |
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208 if (i >= 0 && i < INT_CONSTANT_CACHE.length) { |
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209 return INT_CONSTANT_CACHE[i]; |
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210 } |
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211 return new PrimitiveConstant(Kind.Int, i); |
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212 } |
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213 |
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214 /** |
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215 * Creates a boxed byte constant. |
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216 * |
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217 * @param i the byte value to box |
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218 * @return a boxed copy of {@code value} |
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219 */ |
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220 public static Constant forByte(byte i) { |
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221 return new PrimitiveConstant(Kind.Byte, i); |
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222 } |
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223 |
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224 /** |
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225 * Creates a boxed boolean constant. |
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226 * |
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227 * @param i the boolean value to box |
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228 * @return a boxed copy of {@code value} |
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229 */ |
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230 public static Constant forBoolean(boolean i) { |
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231 return i ? TRUE : FALSE; |
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232 } |
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233 |
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234 /** |
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235 * Creates a boxed char constant. |
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236 * |
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237 * @param i the char value to box |
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238 * @return a boxed copy of {@code value} |
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239 */ |
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240 public static Constant forChar(char i) { |
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241 return new PrimitiveConstant(Kind.Char, i); |
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242 } |
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243 |
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244 /** |
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245 * Creates a boxed short constant. |
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246 * |
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247 * @param i the short value to box |
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248 * @return a boxed copy of {@code value} |
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249 */ |
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250 public static Constant forShort(short i) { |
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251 return new PrimitiveConstant(Kind.Short, i); |
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252 } |
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253 |
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254 /** |
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255 * Creates a {@link Constant} from a primitive integer of a certain kind. |
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256 */ |
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257 public static Constant forIntegerKind(Kind kind, long i) { |
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258 switch (kind) { |
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259 case Int: |
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260 return new PrimitiveConstant(kind, (int) i); |
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261 case Long: |
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262 return new PrimitiveConstant(kind, i); |
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263 default: |
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264 throw new IllegalArgumentException("not an integer kind: " + kind); |
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265 } |
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266 } |
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267 |
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268 /** |
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269 * Creates a {@link Constant} from a primitive integer of a certain width. |
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270 */ |
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271 public static Constant forPrimitiveInt(int bits, long i) { |
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272 assert bits <= 64; |
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273 if (bits > 32) { |
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274 return new PrimitiveConstant(Kind.Long, i); |
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275 } else { |
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276 return new PrimitiveConstant(Kind.Int, (int) i); |
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277 } |
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278 } |
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279 |
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280 /** |
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281 * Creates a boxed constant for the given boxed primitive value. |
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282 * |
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283 * @param value the Java boxed value |
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284 * @return the primitive constant holding the {@code value} |
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285 */ |
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286 public static Constant forBoxedPrimitive(Object value) { |
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287 if (value instanceof Boolean) { |
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288 return forBoolean((Boolean) value); |
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289 } else if (value instanceof Byte) { |
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290 return forByte((Byte) value); |
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291 } else if (value instanceof Character) { |
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292 return forChar((Character) value); |
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293 } else if (value instanceof Short) { |
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294 return forShort((Short) value); |
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295 } else if (value instanceof Integer) { |
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296 return forInt((Integer) value); |
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297 } else if (value instanceof Long) { |
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298 return forLong((Long) value); |
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299 } else if (value instanceof Float) { |
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300 return forFloat((Float) value); |
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301 } else if (value instanceof Double) { |
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302 return forDouble((Double) value); |
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303 } else { |
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304 return null; |
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305 } |
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306 } |
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307 |
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308 public static Constant forIllegal() { |
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309 return new PrimitiveConstant(Kind.Illegal, 0); |
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310 } |
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311 |
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312 /** |
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313 * Returns a constant with the default value for the given kind. |
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314 */ |
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315 public static Constant defaultForKind(Kind kind) { |
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316 switch (kind) { |
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317 case Boolean: |
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318 return FALSE; |
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319 case Byte: |
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320 return forByte((byte) 0); |
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321 case Char: |
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322 return forChar((char) 0); |
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323 case Short: |
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324 return forShort((short) 0); |
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325 case Int: |
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326 return INT_0; |
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327 case Double: |
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328 return DOUBLE_0; |
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329 case Float: |
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330 return FLOAT_0; |
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331 case Long: |
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332 return LONG_0; |
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333 case Object: |
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334 return NULL_OBJECT; |
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335 default: |
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336 throw new IllegalArgumentException(kind.toString()); |
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337 } |
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338 } |
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339 |
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340 /** |
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341 * Returns the zero value for a given numeric kind. |
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342 */ |
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343 public static Constant zero(Kind kind) { |
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344 switch (kind) { |
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345 case Byte: |
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346 return forByte((byte) 0); |
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347 case Char: |
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348 return forChar((char) 0); |
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349 case Double: |
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350 return DOUBLE_0; |
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351 case Float: |
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352 return FLOAT_0; |
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353 case Int: |
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354 return INT_0; |
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355 case Long: |
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356 return LONG_0; |
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357 case Short: |
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358 return forShort((short) 0); |
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359 default: |
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360 throw new IllegalArgumentException(kind.toString()); |
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361 } |
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362 } |
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363 |
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364 /** |
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365 * Returns the one value for a given numeric kind. |
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366 */ |
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367 public static Constant one(Kind kind) { |
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368 switch (kind) { |
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369 case Byte: |
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370 return forByte((byte) 1); |
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371 case Char: |
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372 return forChar((char) 1); |
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373 case Double: |
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374 return DOUBLE_1; |
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375 case Float: |
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376 return FLOAT_1; |
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377 case Int: |
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378 return INT_1; |
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379 case Long: |
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380 return LONG_1; |
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381 case Short: |
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382 return forShort((short) 1); |
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383 default: |
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384 throw new IllegalArgumentException(kind.toString()); |
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385 } |
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386 } |
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387 |
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388 /** |
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389 * Adds two numeric constants. |
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390 */ |
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391 public static Constant add(Constant x, Constant y) { |
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392 assert x.getKind() == y.getKind(); |
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393 switch (x.getKind()) { |
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394 case Byte: |
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395 return forByte((byte) (x.asInt() + y.asInt())); |
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396 case Char: |
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397 return forChar((char) (x.asInt() + y.asInt())); |
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398 case Double: |
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399 return forDouble(x.asDouble() + y.asDouble()); |
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400 case Float: |
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401 return forFloat(x.asFloat() + y.asFloat()); |
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402 case Int: |
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403 return forInt(x.asInt() + y.asInt()); |
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404 case Long: |
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405 return forLong(x.asLong() + y.asLong()); |
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406 case Short: |
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407 return forShort((short) (x.asInt() + y.asInt())); |
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408 default: |
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409 throw new IllegalArgumentException(x.getKind().toString()); |
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410 } |
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411 } |
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412 |
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413 /** |
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414 * Multiplies two numeric constants. |
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415 */ |
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416 public static Constant mul(Constant x, Constant y) { |
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417 assert x.getKind() == y.getKind(); |
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418 switch (x.getKind()) { |
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419 case Byte: |
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420 return forByte((byte) (x.asInt() * y.asInt())); |
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421 case Char: |
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422 return forChar((char) (x.asInt() * y.asInt())); |
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423 case Double: |
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424 return forDouble(x.asDouble() * y.asDouble()); |
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425 case Float: |
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426 return forFloat(x.asFloat() * y.asFloat()); |
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427 case Int: |
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428 return forInt(x.asInt() * y.asInt()); |
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429 case Long: |
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430 return forLong(x.asLong() * y.asLong()); |
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431 case Short: |
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432 return forShort((short) (x.asInt() * y.asInt())); |
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433 default: |
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434 throw new IllegalArgumentException(x.getKind().toString()); |
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435 } |
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436 } |
3733
e233f5660da4
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437 } |