Mercurial > hg > graal-jvmci-8
annotate graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/Constant.java @ 6708:a5156d39b622
add isDefaultForKind to Constant
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Mon, 12 Nov 2012 17:46:21 +0100 |
parents | 2463eb24b644 |
children | fd1c171d9969 |
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 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(Kind.Object, 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. This is ignored iff {@code !kind.isObject()}. |
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67 */ |
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68 private final Object object; |
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69 |
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70 /** |
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71 * The boxed primitive value as a {@code long}. This is ignored iff {@code kind.isObject()}. For {@code float} and |
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72 * {@code double} values, this value is the result of {@link Float#floatToRawIntBits(float)} and |
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73 * {@link Double#doubleToRawLongBits(double)} respectively. |
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74 */ |
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75 private final long primitive; |
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76 |
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77 /** |
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78 * Create a new constant represented by the specified object reference. |
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79 * |
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80 * @param kind the type of this constant |
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81 * @param object the value of this constant |
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82 */ |
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83 private Constant(Kind kind, Object object) { |
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84 super(kind); |
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85 this.object = object; |
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86 this.primitive = 0L; |
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87 } |
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88 |
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89 /** |
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90 * Create a new constant represented by the specified primitive. |
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91 * |
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92 * @param kind the type of this constant |
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93 * @param primitive the value of this constant |
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94 */ |
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95 public Constant(Kind kind, long primitive) { |
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96 super(kind); |
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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 * Checks whether this constant is non-null. |
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103 * |
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104 * @return {@code true} if this constant is a primitive, or an object constant that is not null |
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105 */ |
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106 public boolean isNonNull() { |
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107 return !getKind().isObject() || object != null; |
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108 } |
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109 |
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110 /** |
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111 * Checks whether this constant is null. |
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112 * |
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113 * @return {@code true} if this constant is the null constant |
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114 */ |
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115 public boolean isNull() { |
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116 return getKind().isObject() && object == null; |
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117 } |
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118 |
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119 /** |
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120 * Checks whether this constant is the default value for its kind (null, 0, 0.0, false). |
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121 * |
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122 * @return {@code true} if this constant is the default value for its kind |
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123 */ |
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124 public boolean isDefaultForKind() { |
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125 return object == null && primitive == 0; |
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126 } |
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127 |
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128 @Override |
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129 public String toString() { |
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130 return getKind().getJavaName() + "[" + getKind().format(asBoxedValue()) + (getKind() != Kind.Object ? "|0x" + Long.toHexString(primitive) : "") + "]"; |
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131 } |
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132 |
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133 /** |
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134 * Returns the value of this constant as a boxed Java value. |
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135 * |
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136 * @return the value of this constant |
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137 */ |
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138 public Object asBoxedValue() { |
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139 switch (getKind()) { |
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140 case Byte: |
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141 return (byte) asInt(); |
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142 case Boolean: |
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143 return asInt() == 0 ? Boolean.FALSE : Boolean.TRUE; |
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144 case Short: |
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145 return (short) asInt(); |
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146 case Char: |
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147 return (char) asInt(); |
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148 case Jsr: |
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149 return (int) primitive; |
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150 case Int: |
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151 return asInt(); |
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152 case Long: |
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153 return asLong(); |
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154 case Float: |
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155 return asFloat(); |
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156 case Double: |
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157 return asDouble(); |
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158 case Object: |
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159 return object; |
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160 } |
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161 throw new IllegalArgumentException(); |
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162 } |
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163 |
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164 private boolean valueEqual(Constant other, boolean ignoreKind) { |
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165 // must have equivalent kinds to be equal |
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166 if (!ignoreKind && getKind() != other.getKind()) { |
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167 return false; |
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168 } |
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169 if (getKind().isObject()) { |
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170 return object == other.object; |
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171 } |
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172 return primitive == other.primitive; |
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173 } |
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174 |
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175 /** |
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176 * Converts this constant to a primitive int. |
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177 * |
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178 * @return the int value of this constant |
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179 */ |
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180 public int asInt() { |
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181 if (getKind().getStackKind().isStackInt() || getKind().isJsr()) { |
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182 return (int) primitive; |
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183 } |
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184 throw new Error("Constant is not int: " + this); |
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185 } |
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186 |
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187 /** |
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188 * Converts this constant to a primitive boolean. |
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189 * |
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190 * @return the boolean value of this constant |
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191 */ |
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192 public boolean asBoolean() { |
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193 if (getKind() == Kind.Boolean) { |
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194 return primitive != 0L; |
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195 } |
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196 throw new Error("Constant is not boolean: " + this); |
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197 } |
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198 |
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199 /** |
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200 * Converts this constant to a primitive long. |
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201 * |
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202 * @return the long value of this constant |
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203 */ |
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204 public long asLong() { |
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205 switch (getKind().getStackKind()) { |
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206 case Jsr: |
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207 case Int: |
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208 case Long: |
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209 return primitive; |
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210 case Float: |
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211 return (long) asFloat(); |
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212 case Double: |
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213 return (long) asDouble(); |
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214 default: |
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215 throw new Error("Constant is not long: " + this); |
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216 } |
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217 } |
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218 |
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219 /** |
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220 * Converts this constant to a primitive float. |
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221 * |
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222 * @return the float value of this constant |
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223 */ |
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224 public float asFloat() { |
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225 if (getKind().isFloat()) { |
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226 return Float.intBitsToFloat((int) primitive); |
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227 } |
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228 throw new Error("Constant is not float: " + this); |
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229 } |
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230 |
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231 /** |
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232 * Converts this constant to a primitive double. |
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233 * |
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234 * @return the double value of this constant |
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235 */ |
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236 public double asDouble() { |
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237 if (getKind().isFloat()) { |
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238 return Float.intBitsToFloat((int) primitive); |
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239 } |
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240 if (getKind().isDouble()) { |
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241 return Double.longBitsToDouble(primitive); |
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242 } |
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243 throw new Error("Constant is not double: " + this); |
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244 } |
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245 |
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246 /** |
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247 * Converts this constant to the object reference it represents. |
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248 * |
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249 * @return the object which this constant represents |
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250 */ |
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251 public Object asObject() { |
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252 if (getKind().isObject()) { |
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253 return object; |
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254 } |
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255 throw new Error("Constant is not object: " + this); |
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256 } |
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257 |
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258 /** |
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259 * Converts this constant to the jsr reference it represents. |
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260 * |
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261 * @return the object which this constant represents |
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262 */ |
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263 public int asJsr() { |
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264 if (getKind().isJsr()) { |
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265 return (int) primitive; |
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266 } |
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267 throw new Error("Constant is not jsr: " + this); |
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268 } |
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269 |
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270 /** |
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271 * Unchecked access to a primitive value. |
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272 */ |
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273 public long asPrimitive() { |
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274 if (getKind().isObject()) { |
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275 throw new Error("Constant is not primitive: " + this); |
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276 } |
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277 return primitive; |
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278 } |
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279 |
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280 /** |
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281 * Computes the hashcode of this constant. |
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282 * |
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283 * @return a suitable hashcode for this constant |
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284 */ |
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285 @Override |
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286 public int hashCode() { |
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287 if (getKind().isObject()) { |
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288 return System.identityHashCode(object); |
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289 } |
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290 return (int) primitive; |
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291 } |
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292 |
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293 /** |
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294 * Checks whether this constant equals another object. This is only true if the other object is a constant and has |
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295 * the same value. |
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296 * |
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297 * @param o the object to compare equality |
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298 * @return {@code true} if this constant is equivalent to the specified object |
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299 */ |
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300 @Override |
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301 public boolean equals(Object o) { |
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302 return o == this || o instanceof Constant && valueEqual((Constant) o, false); |
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303 } |
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304 |
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305 /** |
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306 * Creates a boxed double constant. |
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307 * |
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308 * @param d the double value to box |
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309 * @return a boxed copy of {@code value} |
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310 */ |
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311 public static Constant forDouble(double d) { |
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312 if (Double.compare(0.0D, d) == 0) { |
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313 return DOUBLE_0; |
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314 } |
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315 if (Double.compare(d, 1.0D) == 0) { |
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316 return DOUBLE_1; |
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317 } |
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318 return new Constant(Kind.Double, Double.doubleToRawLongBits(d)); |
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319 } |
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320 |
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321 /** |
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322 * Creates a boxed float constant. |
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323 * |
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324 * @param f the float value to box |
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325 * @return a boxed copy of {@code value} |
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326 */ |
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327 public static Constant forFloat(float f) { |
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328 if (Float.compare(f, 0.0F) == 0) { |
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329 return FLOAT_0; |
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330 } |
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331 if (Float.compare(f, 1.0F) == 0) { |
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332 return FLOAT_1; |
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333 } |
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334 if (Float.compare(f, 2.0F) == 0) { |
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335 return FLOAT_2; |
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336 } |
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337 return new Constant(Kind.Float, Float.floatToRawIntBits(f)); |
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338 } |
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339 |
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340 /** |
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341 * Creates a boxed long constant. |
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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.
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342 * |
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343 * @param i the long value to box |
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344 * @return a boxed copy of {@code value} |
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345 */ |
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346 public static Constant forLong(long i) { |
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347 return i == 0 ? LONG_0 : i == 1 ? LONG_1 : new Constant(Kind.Long, i); |
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348 } |
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349 |
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350 /** |
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351 * Creates a boxed integer constant. |
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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.
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352 * |
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353 * @param i the integer value to box |
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354 * @return a boxed copy of {@code value} |
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355 */ |
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356 public static Constant forInt(int i) { |
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357 if (i == -1) { |
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358 return INT_MINUS_1; |
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359 } |
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360 if (i >= 0 && i < INT_CONSTANT_CACHE.length) { |
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361 return INT_CONSTANT_CACHE[i]; |
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362 } |
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363 return new Constant(Kind.Int, i); |
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364 } |
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365 |
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366 /** |
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367 * Creates a boxed byte constant. |
6539
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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.
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368 * |
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369 * @param i the byte value to box |
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370 * @return a boxed copy of {@code value} |
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371 */ |
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372 public static Constant forByte(byte i) { |
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373 return new Constant(Kind.Byte, i); |
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374 } |
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375 |
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376 /** |
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377 * Creates a boxed boolean constant. |
6539
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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>
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378 * |
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379 * @param i the boolean value to box |
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380 * @return a boxed copy of {@code value} |
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381 */ |
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382 public static Constant forBoolean(boolean i) { |
3733
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383 return i ? TRUE : FALSE; |
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384 } |
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385 |
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|
386 /** |
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387 * Creates a boxed char constant. |
6539
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388 * |
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389 * @param i the char value to box |
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390 * @return a boxed copy of {@code value} |
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391 */ |
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392 public static Constant forChar(char i) { |
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393 return new Constant(Kind.Char, i); |
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394 } |
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395 |
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|
396 /** |
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397 * Creates a boxed short constant. |
6539
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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.
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398 * |
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399 * @param i the short value to box |
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400 * @return a boxed copy of {@code value} |
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|
401 */ |
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402 public static Constant forShort(short i) { |
5540
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403 return new Constant(Kind.Short, i); |
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|
404 } |
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diff
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|
405 |
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parents:
diff
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|
406 /** |
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parents:
diff
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|
407 * Creates a boxed address (jsr/ret address) constant. |
6539
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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>
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diff
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|
408 * |
3733
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|
409 * @param i the address value to box |
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|
410 * @return a boxed copy of {@code value} |
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parents:
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|
411 */ |
5538
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|
412 public static Constant forJsr(int i) { |
5540
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|
413 return new Constant(Kind.Jsr, i); |
3733
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|
414 } |
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parents:
diff
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|
415 |
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parents:
diff
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|
416 /** |
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diff
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|
417 * Creates a boxed object constant. |
6539
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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:
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diff
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|
418 * |
3733
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|
419 * @param o the object value to box |
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420 * @return a boxed copy of {@code value} |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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|
421 */ |
5538
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|
422 public static Constant forObject(Object o) { |
3733
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423 if (o == null) { |
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|
424 return NULL_OBJECT; |
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parents:
diff
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|
425 } |
5540
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|
426 return new Constant(Kind.Object, o); |
3733
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|
427 } |
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|
428 |
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parents:
diff
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|
429 /** |
6539
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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.
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parents:
6329
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|
430 * 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.
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|
431 * corresponding to the kind. |
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.
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|
432 * |
3733
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|
433 * @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
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|
434 * @param value the Java boxed value: a {@link Byte} instance for {@link Kind#Byte}, etc. |
3733
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|
435 * @return the boxed copy of {@code value} |
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parents:
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|
436 */ |
5540
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|
437 public static Constant forBoxed(Kind kind, Object value) { |
3733
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diff
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|
438 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
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|
439 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
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4199
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|
440 return forBoolean((Boolean) value); |
3733
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|
441 case Byte: |
e233f5660da4
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diff
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|
442 return forByte((Byte) value); |
e233f5660da4
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parents:
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|
443 case Char: |
e233f5660da4
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|
444 return forChar((Character) value); |
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parents:
diff
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|
445 case Short: |
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diff
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|
446 return forShort((Short) value); |
e233f5660da4
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parents:
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|
447 case Int: |
e233f5660da4
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parents:
diff
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|
448 return forInt((Integer) value); |
e233f5660da4
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parents:
diff
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|
449 case Long: |
e233f5660da4
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parents:
diff
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|
450 return forLong((Long) value); |
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parents:
diff
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|
451 case Float: |
e233f5660da4
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parents:
diff
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|
452 return forFloat((Float) value); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
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|
453 case Double: |
e233f5660da4
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
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|
454 return forDouble((Double) value); |
e233f5660da4
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
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|
455 case Object: |
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parents:
diff
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|
456 return forObject(value); |
e233f5660da4
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
457 default: |
5572
8f9c9d372e31
small renaming and doc fixes
Lukas Stadler <lukas.stadler@jku.at>
parents:
5543
diff
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|
458 throw new RuntimeException("cannot create Constant for boxed " + kind + " value"); |
3733
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diff
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|
459 } |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
460 } |
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
461 } |