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annotate graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/meta/HotSpotObjectConstant.java @ 15909:e43591136d9f

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Support for compressed constants.
author Roland Schatz <roland.schatz@oracle.com>
date Mon, 26 May 2014 16:09:53 +0200
parents db4254246f9a
children c0b8d395368b
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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.hotspot.meta;
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24
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25 import com.oracle.graal.api.meta.*;
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26 import com.oracle.graal.hotspot.nodes.type.*;
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27
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28 /**
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29 * Represents a constant non-{@code null} object reference, within the compiler and across the
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30 * compiler/runtime interface.
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31 */
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32 public final class HotSpotObjectConstant extends Constant implements HotSpotConstant {
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33
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34 private static final long serialVersionUID = 3592151693708093496L;
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35
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36 public static Constant forObject(Object object) {
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37 if (object == null) {
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38 return Constant.NULL_OBJECT;
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39 } else {
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40 return new HotSpotObjectConstant(object, false);
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41 }
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42 }
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43
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44 public static Constant forBoxedValue(Kind kind, Object value) {
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45 if (kind == Kind.Object) {
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46 return HotSpotObjectConstant.forObject(value);
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47 } else {
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48 return Constant.forBoxedPrimitive(value);
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49 }
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50 }
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51
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52 public static Object asObject(Constant constant) {
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53 if (constant.isNull()) {
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54 return null;
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55 } else {
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56 return ((HotSpotObjectConstant) constant).object;
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57 }
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58 }
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59
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60 public static Object asBoxedValue(Constant constant) {
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61 if (constant.isNull()) {
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62 return null;
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63 } else if (constant instanceof HotSpotObjectConstant) {
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64 return ((HotSpotObjectConstant) constant).object;
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65 } else {
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66 return constant.asBoxedPrimitive();
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67 }
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68 }
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69
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70 public static boolean isCompressed(Constant constant) {
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71 if (constant.isNull()) {
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72 return HotSpotCompressedNullConstant.NULL_OBJECT.equals(constant);
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73 } else {
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74 return ((HotSpotObjectConstant) constant).compressed;
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75 }
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76 }
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77
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78 private final Object object;
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79 private final boolean compressed;
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80
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81 private HotSpotObjectConstant(Object object, boolean compressed) {
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82 super(compressed ? NarrowOopStamp.NarrowOop : Kind.Object);
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83 this.object = object;
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84 this.compressed = compressed;
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85 assert object != null;
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86 }
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87
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88 public Constant compress() {
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89 assert !compressed;
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90 return new HotSpotObjectConstant(object, true);
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91 }
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92
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93 public Constant uncompress() {
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94 assert compressed;
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95 return new HotSpotObjectConstant(object, false);
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96 }
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97
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98 @Override
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99 public boolean isNull() {
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100 return false;
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101 }
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102
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103 @Override
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104 public boolean isDefaultForKind() {
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105 return false;
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106 }
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107
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108 @Override
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109 public Object asBoxedPrimitive() {
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110 throw new IllegalArgumentException();
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111 }
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112
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113 @Override
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114 public int asInt() {
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115 throw new IllegalArgumentException();
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116 }
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117
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118 @Override
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119 public boolean asBoolean() {
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120 throw new IllegalArgumentException();
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121 }
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122
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123 @Override
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124 public long asLong() {
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125 throw new IllegalArgumentException();
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126 }
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127
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128 @Override
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129 public float asFloat() {
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130 throw new IllegalArgumentException();
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131 }
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132
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133 @Override
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134 public double asDouble() {
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135 throw new IllegalArgumentException();
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136 }
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137
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138 @Override
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139 public int hashCode() {
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140 return System.identityHashCode(object);
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141 }
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142
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143 @Override
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144 public boolean equals(Object o) {
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145 return o == this || (o instanceof HotSpotObjectConstant && super.equals(o) && object == ((HotSpotObjectConstant) o).object);
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146 }
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147
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148 @Override
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149 public String toValueString() {
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150 if (object instanceof String) {
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151 return (String) object;
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152 } else {
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153 return Kind.Object.format(object);
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154 }
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155 }
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156
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157 @Override
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158 public String toString() {
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159 return (compressed ? "NarrowOop" : getKind().getJavaName()) + "[" + Kind.Object.format(object) + "]";
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160 }
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161 }