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annotate graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/meta/HotSpotObjectConstant.java @ 18188:8652481a1110

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Introduce new Constant interface for use in high-level graph.
author Roland Schatz <roland.schatz@oracle.com>
date Thu, 30 Oct 2014 13:03:33 +0100
parents 9619ba4daf4c
children f7d45e2426d4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2009, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.hotspot.meta;
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24
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25 import com.oracle.graal.api.meta.*;
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26
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27 /**
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28 * Represents a constant non-{@code null} object reference, within the compiler and across the
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29 * compiler/runtime interface.
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30 */
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31 public final class HotSpotObjectConstant extends JavaConstant implements HotSpotConstant, VMConstant {
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32
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33 private static final long serialVersionUID = 3592151693708093496L;
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34
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35 public static JavaConstant forObject(Object object) {
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36 if (object == null) {
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37 return JavaConstant.NULL_OBJECT;
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38 } else {
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39 return new HotSpotObjectConstant(object, false);
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40 }
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41 }
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42
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43 public static JavaConstant forBoxedValue(Kind kind, Object value) {
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44 if (kind == Kind.Object) {
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45 return HotSpotObjectConstant.forObject(value);
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46 } else {
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47 return JavaConstant.forBoxedPrimitive(value);
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48 }
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49 }
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50
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51 public static Object asObject(Constant constant) {
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52 if (JavaConstant.isNull(constant)) {
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53 return null;
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54 } else {
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55 return ((HotSpotObjectConstant) constant).object;
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56 }
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57 }
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58
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59 public static Object asBoxedValue(Constant constant) {
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60 if (JavaConstant.isNull(constant)) {
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61 return null;
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62 } else if (constant instanceof HotSpotObjectConstant) {
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63 return ((HotSpotObjectConstant) constant).object;
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64 } else {
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65 return ((JavaConstant) constant).asBoxedPrimitive();
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66 }
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67 }
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68
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69 public static boolean isCompressed(Constant constant) {
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70 if (JavaConstant.isNull(constant)) {
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71 return HotSpotCompressedNullConstant.NULL_OBJECT.equals(constant);
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72 } else {
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73 return ((HotSpotObjectConstant) constant).compressed;
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74 }
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75 }
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76
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77 private final Object object;
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78 private final boolean compressed;
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79
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80 private HotSpotObjectConstant(Object object, boolean compressed) {
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81 super(LIRKind.reference(compressed ? Kind.Int : Kind.Object));
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82 this.object = object;
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83 this.compressed = compressed;
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84 assert object != null;
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85 }
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86
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87 public JavaConstant compress() {
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88 assert !compressed;
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89 return new HotSpotObjectConstant(object, true);
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90 }
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91
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92 public JavaConstant uncompress() {
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93 assert compressed;
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94 return new HotSpotObjectConstant(object, false);
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95 }
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96
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97 @Override
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98 public boolean isNull() {
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99 return false;
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100 }
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101
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102 @Override
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103 public boolean isDefaultForKind() {
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104 return false;
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105 }
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106
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107 @Override
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108 public Object asBoxedPrimitive() {
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109 throw new IllegalArgumentException();
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110 }
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111
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112 @Override
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113 public int asInt() {
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114 throw new IllegalArgumentException();
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115 }
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116
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117 @Override
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118 public boolean asBoolean() {
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119 throw new IllegalArgumentException();
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120 }
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121
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122 @Override
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123 public long asLong() {
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124 throw new IllegalArgumentException();
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125 }
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126
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127 @Override
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128 public float asFloat() {
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129 throw new IllegalArgumentException();
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130 }
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131
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132 @Override
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133 public double asDouble() {
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134 throw new IllegalArgumentException();
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135 }
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136
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137 @Override
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138 public int hashCode() {
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139 return System.identityHashCode(object);
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140 }
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141
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142 @Override
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143 public boolean equals(Object o) {
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144 return o == this || (o instanceof HotSpotObjectConstant && super.equals(o) && object == ((HotSpotObjectConstant) o).object);
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145 }
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146
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147 @Override
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148 public String toValueString() {
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149 if (object instanceof String) {
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150 return (String) object;
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151 } else {
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152 return Kind.Object.format(object);
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153 }
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154 }
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155
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156 @Override
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157 public String toString() {
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158 return (compressed ? "NarrowOop" : getKind().getJavaName()) + "[" + Kind.Object.format(object) + "]";
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159 }
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160 }