Mercurial > hg > graal-jvmci-8
annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotMemoryAccessProviderImpl.java @ 23361:dafcbf1bb9cd
HotSpotMemoryAccessProviderImpl.readObjectConstant should support reading fields in objects (JDK-8155626)
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 28 Apr 2016 13:32:46 +0200 |
parents | 73ceb487b9ca |
children | 19855d029fc0 |
rev | line source |
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1 /* |
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2 * Copyright (c) 2011, 2016, 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 jdk.vm.ci.hotspot; |
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24 |
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25 import static jdk.vm.ci.hotspot.UnsafeAccess.UNSAFE; |
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26 import jdk.vm.ci.hotspot.HotSpotVMConfig.CompressEncoding; |
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27 import jdk.vm.ci.meta.Constant; |
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28 import jdk.vm.ci.meta.JavaConstant; |
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29 import jdk.vm.ci.meta.JavaKind; |
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30 import jdk.vm.ci.meta.MemoryAccessProvider; |
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31 import jdk.vm.ci.meta.PrimitiveConstant; |
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32 |
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33 /** |
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34 * HotSpot implementation of {@link MemoryAccessProvider}. |
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35 */ |
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36 class HotSpotMemoryAccessProviderImpl implements HotSpotMemoryAccessProvider, HotSpotProxified { |
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37 |
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38 protected final HotSpotJVMCIRuntimeProvider runtime; |
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39 |
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40 HotSpotMemoryAccessProviderImpl(HotSpotJVMCIRuntimeProvider runtime) { |
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41 this.runtime = runtime; |
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42 } |
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43 |
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44 private static Object asObject(Constant base) { |
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45 if (base instanceof HotSpotObjectConstantImpl) { |
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46 return ((HotSpotObjectConstantImpl) base).object(); |
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47 } else { |
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48 return null; |
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49 } |
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50 } |
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51 |
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52 private boolean isValidObjectFieldDisplacement(Constant base, long displacement) { |
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53 if (base instanceof HotSpotMetaspaceConstant) { |
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54 MetaspaceWrapperObject metaspaceObject = HotSpotMetaspaceConstantImpl.getMetaspaceObject(base); |
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55 if (metaspaceObject instanceof HotSpotResolvedObjectTypeImpl) { |
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56 if (displacement == runtime.getConfig().classMirrorOffset) { |
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57 // Klass::_java_mirror is valid for all Klass* values |
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58 return true; |
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59 } else if (displacement == runtime.getConfig().arrayKlassComponentMirrorOffset) { |
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60 // ArrayKlass::_component_mirror is only valid for all ArrayKlass* values |
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61 return ((HotSpotResolvedObjectTypeImpl) metaspaceObject).mirror().isArray(); |
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62 } |
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63 } else { |
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64 throw new IllegalArgumentException(String.valueOf(metaspaceObject)); |
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65 } |
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66 } |
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67 return false; |
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68 } |
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69 |
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70 private static long asRawPointer(Constant base) { |
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71 if (base instanceof HotSpotMetaspaceConstantImpl) { |
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72 MetaspaceWrapperObject meta = HotSpotMetaspaceConstantImpl.getMetaspaceObject(base); |
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73 return meta.getMetaspacePointer(); |
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74 } else if (base instanceof PrimitiveConstant) { |
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75 PrimitiveConstant prim = (PrimitiveConstant) base; |
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76 if (prim.getJavaKind().isNumericInteger()) { |
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77 return prim.asLong(); |
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78 } |
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79 } |
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80 throw new IllegalArgumentException(String.valueOf(base)); |
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81 } |
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82 |
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83 private static long readRawValue(Constant baseConstant, long displacement, int bits) { |
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84 Object base = asObject(baseConstant); |
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85 if (base != null) { |
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86 switch (bits) { |
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87 case Byte.SIZE: |
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88 return UNSAFE.getByte(base, displacement); |
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89 case Short.SIZE: |
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90 return UNSAFE.getShort(base, displacement); |
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91 case Integer.SIZE: |
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92 return UNSAFE.getInt(base, displacement); |
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93 case Long.SIZE: |
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94 return UNSAFE.getLong(base, displacement); |
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95 default: |
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96 throw new IllegalArgumentException(String.valueOf(bits)); |
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97 } |
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98 } else { |
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99 long pointer = asRawPointer(baseConstant); |
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100 switch (bits) { |
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101 case Byte.SIZE: |
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102 return UNSAFE.getByte(pointer + displacement); |
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103 case Short.SIZE: |
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104 return UNSAFE.getShort(pointer + displacement); |
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105 case Integer.SIZE: |
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106 return UNSAFE.getInt(pointer + displacement); |
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107 case Long.SIZE: |
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108 return UNSAFE.getLong(pointer + displacement); |
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109 default: |
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110 throw new IllegalArgumentException(String.valueOf(bits)); |
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111 } |
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112 } |
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113 } |
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114 |
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115 private boolean verifyReadRawObject(Object expected, Constant base, long displacement, boolean compressed) { |
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116 if (compressed == runtime.getConfig().useCompressedOops) { |
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117 Object obj = asObject(base); |
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118 if (obj != null) { |
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119 assert expected == UNSAFE.getObject(obj, displacement) : "readUnsafeOop doesn't agree with unsafe.getObject"; |
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120 } |
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121 } |
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122 if (base instanceof HotSpotMetaspaceConstant) { |
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123 MetaspaceWrapperObject metaspaceObject = HotSpotMetaspaceConstantImpl.getMetaspaceObject(base); |
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124 if (metaspaceObject instanceof HotSpotResolvedObjectTypeImpl) { |
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125 if (displacement == runtime.getConfig().classMirrorOffset) { |
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126 assert expected == ((HotSpotResolvedObjectTypeImpl) metaspaceObject).mirror(); |
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127 } else if (displacement == runtime.getConfig().arrayKlassComponentMirrorOffset) { |
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128 assert expected == ((HotSpotResolvedObjectTypeImpl) metaspaceObject).mirror().getComponentType(); |
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129 } |
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130 } |
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131 } |
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132 return true; |
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133 } |
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134 |
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135 private Object readRawObject(Constant baseConstant, long initialDisplacement, boolean compressed) { |
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136 long displacement = initialDisplacement; |
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137 |
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138 Object ret; |
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139 Object base = asObject(baseConstant); |
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140 if (base == null) { |
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141 assert !compressed; |
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142 displacement += asRawPointer(baseConstant); |
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143 ret = runtime.getCompilerToVM().readUncompressedOop(displacement); |
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144 } else { |
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145 assert runtime.getConfig().useCompressedOops == compressed; |
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146 ret = UNSAFE.getObject(base, displacement); |
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147 } |
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148 assert verifyReadRawObject(ret, baseConstant, initialDisplacement, compressed); |
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149 return ret; |
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150 } |
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151 |
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152 @Override |
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153 public JavaConstant readUnsafeConstant(JavaKind kind, JavaConstant baseConstant, long displacement) { |
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154 if (kind == null) { |
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155 throw new IllegalArgumentException(); |
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156 } |
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157 if (kind == JavaKind.Object) { |
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158 Object o = readRawObject(baseConstant, displacement, runtime.getConfig().useCompressedOops); |
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159 return HotSpotObjectConstantImpl.forObject(o); |
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160 } else { |
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161 int bits = kind.getByteCount() * Byte.SIZE; |
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162 return readPrimitiveConstant(kind, baseConstant, displacement, bits); |
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163 } |
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164 } |
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165 |
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166 @Override |
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167 public JavaConstant readPrimitiveConstant(JavaKind kind, Constant baseConstant, long initialDisplacement, int bits) { |
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168 try { |
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169 long rawValue = readRawValue(baseConstant, initialDisplacement, bits); |
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170 switch (kind) { |
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171 case Boolean: |
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172 return JavaConstant.forBoolean(rawValue != 0); |
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173 case Byte: |
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174 return JavaConstant.forByte((byte) rawValue); |
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175 case Char: |
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176 return JavaConstant.forChar((char) rawValue); |
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177 case Short: |
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178 return JavaConstant.forShort((short) rawValue); |
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179 case Int: |
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180 return JavaConstant.forInt((int) rawValue); |
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181 case Long: |
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182 return JavaConstant.forLong(rawValue); |
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183 case Float: |
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184 return JavaConstant.forFloat(Float.intBitsToFloat((int) rawValue)); |
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185 case Double: |
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186 return JavaConstant.forDouble(Double.longBitsToDouble(rawValue)); |
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187 default: |
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188 throw new IllegalArgumentException("Unsupported kind: " + kind); |
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189 } |
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190 } catch (NullPointerException e) { |
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191 return null; |
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192 } |
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193 } |
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194 |
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195 @Override |
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196 public JavaConstant readObjectConstant(Constant base, long displacement) { |
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197 if (base instanceof HotSpotObjectConstantImpl) { |
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198 Object o = readRawObject(base, displacement, runtime.getConfig().useCompressedOops); |
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199 return HotSpotObjectConstantImpl.forObject(o); |
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200 } |
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201 if (!isValidObjectFieldDisplacement(base, displacement)) { |
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202 return null; |
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203 } |
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204 return HotSpotObjectConstantImpl.forObject(readRawObject(base, displacement, false)); |
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205 } |
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206 |
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207 @Override |
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208 public JavaConstant readNarrowOopConstant(Constant base, long displacement, CompressEncoding encoding) { |
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209 assert encoding.equals(runtime.getConfig().getOopEncoding()) : "unexpected oop encoding: " + encoding + " != " + runtime.getConfig().getOopEncoding(); |
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210 return HotSpotObjectConstantImpl.forObject(readRawObject(base, displacement, true), true); |
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211 } |
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212 |
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213 private HotSpotResolvedObjectTypeImpl readKlass(Constant base, long displacement, boolean compressed) { |
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214 assert (base instanceof HotSpotMetaspaceConstantImpl) || (base instanceof HotSpotObjectConstantImpl) : base.getClass(); |
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215 Object baseObject = (base instanceof HotSpotMetaspaceConstantImpl) ? ((HotSpotMetaspaceConstantImpl) base).asResolvedJavaType() : ((HotSpotObjectConstantImpl) base).object(); |
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216 return runtime.getCompilerToVM().getResolvedJavaType(baseObject, displacement, compressed); |
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217 } |
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218 |
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219 @Override |
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220 public Constant readKlassPointerConstant(Constant base, long displacement) { |
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221 HotSpotResolvedObjectTypeImpl klass = readKlass(base, displacement, false); |
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222 if (klass == null) { |
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223 return JavaConstant.NULL_POINTER; |
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224 } |
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225 return HotSpotMetaspaceConstantImpl.forMetaspaceObject(klass, false); |
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226 } |
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227 |
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228 @Override |
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229 public Constant readNarrowKlassPointerConstant(Constant base, long displacement, CompressEncoding encoding) { |
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230 HotSpotResolvedObjectTypeImpl klass = readKlass(base, displacement, true); |
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231 if (klass == null) { |
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232 return HotSpotCompressedNullConstant.COMPRESSED_NULL; |
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233 } |
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234 return HotSpotMetaspaceConstantImpl.forMetaspaceObject(klass, true); |
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235 } |
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236 |
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237 @Override |
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238 public Constant readMethodPointerConstant(Constant base, long displacement) { |
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239 assert (base instanceof HotSpotObjectConstantImpl); |
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240 Object baseObject = ((HotSpotObjectConstantImpl) base).object(); |
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241 HotSpotResolvedJavaMethodImpl method = runtime.getCompilerToVM().getResolvedJavaMethod(baseObject, displacement); |
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242 return HotSpotMetaspaceConstantImpl.forMetaspaceObject(method, false); |
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243 } |
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244 |
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245 @Override |
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246 public Constant readSymbolConstant(Constant base, long displacement) { |
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247 int bits = runtime.getConfig().symbolPointerSize * Byte.SIZE; |
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248 long pointer = readRawValue(base, displacement, bits); |
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249 if (pointer == 0) { |
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250 return JavaConstant.NULL_POINTER; |
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251 } else { |
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252 String symbol = runtime.getCompilerToVM().getSymbol(pointer); |
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253 return new HotSpotSymbol(symbol, pointer).asConstant(); |
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254 } |
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255 } |
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256 } |