Mercurial > hg > graal-jvmci-8
annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotMethodHandleAccessProvider.java @ 23785:5cf445d2acf6 jvmci-0.22
Exported elements referring to inaccessible types in jdk.vm.ci (JDK-8167180)
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 11 Oct 2016 22:13:23 +0200 |
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1 /* |
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2 * Copyright (c) 2014, 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 jdk.vm.ci.hotspot; |
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24 |
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25 import static jdk.vm.ci.hotspot.CompilerToVM.compilerToVM; |
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26 import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.runtime; |
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27 |
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28 import java.lang.invoke.MethodHandle; |
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29 import java.util.Objects; |
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30 |
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31 import jdk.vm.ci.common.JVMCIError; |
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32 import jdk.vm.ci.meta.ConstantReflectionProvider; |
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33 import jdk.vm.ci.meta.JavaConstant; |
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34 import jdk.vm.ci.meta.MethodHandleAccessProvider; |
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35 import jdk.vm.ci.meta.ResolvedJavaField; |
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36 import jdk.vm.ci.meta.ResolvedJavaMethod; |
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37 import jdk.vm.ci.meta.ResolvedJavaType; |
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38 |
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39 public class HotSpotMethodHandleAccessProvider implements MethodHandleAccessProvider { |
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40 |
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41 private final ConstantReflectionProvider constantReflection; |
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42 |
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43 public HotSpotMethodHandleAccessProvider(ConstantReflectionProvider constantReflection) { |
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44 this.constantReflection = constantReflection; |
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45 } |
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46 |
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47 /** |
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48 * Lazy initialization to break class initialization cycle. Field and method lookup is only |
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49 * possible after the {@link HotSpotJVMCIRuntime} is fully initialized. |
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50 */ |
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51 static class LazyInitialization { |
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52 static final ResolvedJavaType lambdaFormType; |
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53 static final ResolvedJavaField methodHandleFormField; |
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54 static final ResolvedJavaField lambdaFormVmentryField; |
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55 static final HotSpotResolvedJavaField memberNameVmtargetField; |
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56 |
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57 /** |
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58 * Search for an instance field with the given name in a class. |
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59 * |
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60 * @param declaringType the type declaring the field |
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61 * @param fieldName name of the field to be searched |
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62 * @return resolved java field |
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63 * @throws NoSuchFieldError |
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64 */ |
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65 private static ResolvedJavaField findFieldInClass(ResolvedJavaType declaringType, String fieldName, ResolvedJavaType fieldType) { |
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66 ResolvedJavaField[] fields = declaringType.getInstanceFields(false); |
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67 for (ResolvedJavaField field : fields) { |
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68 if (field.getName().equals(fieldName)) { |
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69 return field; |
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70 } |
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71 } |
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72 throw new NoSuchFieldError(fieldType.getName() + " " + declaringType + "." + fieldName); |
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73 } |
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74 |
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75 private static ResolvedJavaType resolveType(Class<?> c) { |
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76 return runtime().fromClass(c); |
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77 } |
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78 |
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79 private static ResolvedJavaType resolveType(String className) throws ClassNotFoundException { |
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80 return resolveType(Class.forName(className)); |
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81 } |
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82 |
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83 static { |
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84 try { |
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85 ResolvedJavaType methodHandleType = resolveType(MethodHandle.class); |
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86 ResolvedJavaType memberNameType = resolveType("java.lang.invoke.MemberName"); |
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87 lambdaFormType = resolveType("java.lang.invoke.LambdaForm"); |
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88 methodHandleFormField = findFieldInClass(methodHandleType, "form", lambdaFormType); |
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89 lambdaFormVmentryField = findFieldInClass(lambdaFormType, "vmentry", memberNameType); |
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90 memberNameVmtargetField = (HotSpotResolvedJavaField) findFieldInClass(memberNameType, "vmtarget", resolveType(long.class)); |
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91 } catch (Throwable ex) { |
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92 throw new JVMCIError(ex); |
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93 } |
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94 } |
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95 } |
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96 |
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97 @Override |
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98 public IntrinsicMethod lookupMethodHandleIntrinsic(ResolvedJavaMethod method) { |
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99 int intrinsicId = ((HotSpotResolvedJavaMethodImpl) method).intrinsicId(); |
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100 if (intrinsicId != 0) { |
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101 return getMethodHandleIntrinsic(intrinsicId); |
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102 } |
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103 return null; |
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104 } |
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105 |
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106 public static IntrinsicMethod getMethodHandleIntrinsic(int intrinsicId) { |
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107 HotSpotVMConfig config = runtime().getConfig(); |
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108 if (intrinsicId == config.vmIntrinsicInvokeBasic) { |
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109 return IntrinsicMethod.INVOKE_BASIC; |
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110 } else if (intrinsicId == config.vmIntrinsicLinkToInterface) { |
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111 return IntrinsicMethod.LINK_TO_INTERFACE; |
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112 } else if (intrinsicId == config.vmIntrinsicLinkToSpecial) { |
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113 return IntrinsicMethod.LINK_TO_SPECIAL; |
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114 } else if (intrinsicId == config.vmIntrinsicLinkToStatic) { |
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115 return IntrinsicMethod.LINK_TO_STATIC; |
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116 } else if (intrinsicId == config.vmIntrinsicLinkToVirtual) { |
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117 return IntrinsicMethod.LINK_TO_VIRTUAL; |
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118 } |
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119 return null; |
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120 } |
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121 |
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122 @Override |
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123 public ResolvedJavaMethod resolveInvokeBasicTarget(JavaConstant methodHandle, boolean forceBytecodeGeneration) { |
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124 if (methodHandle.isNull()) { |
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125 return null; |
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126 } |
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127 |
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128 /* Load non-public field: LambdaForm MethodHandle.form */ |
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129 JavaConstant lambdaForm = constantReflection.readFieldValue(LazyInitialization.methodHandleFormField, methodHandle); |
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130 if (lambdaForm == null || lambdaForm.isNull()) { |
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131 return null; |
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132 } |
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133 |
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134 JavaConstant memberName = constantReflection.readFieldValue(LazyInitialization.lambdaFormVmentryField, lambdaForm); |
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135 if (memberName.isNull() && forceBytecodeGeneration) { |
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136 Object lf = ((HotSpotObjectConstant) lambdaForm).asObject(LazyInitialization.lambdaFormType); |
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137 compilerToVM().compileToBytecode(Objects.requireNonNull(lf)); |
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138 memberName = constantReflection.readFieldValue(LazyInitialization.lambdaFormVmentryField, lambdaForm); |
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139 assert memberName.isNonNull(); |
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140 } |
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141 return getTargetMethod(memberName); |
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142 } |
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143 |
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144 @Override |
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145 public ResolvedJavaMethod resolveLinkToTarget(JavaConstant memberName) { |
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146 return getTargetMethod(memberName); |
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147 } |
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148 |
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149 /** |
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150 * Returns the {@link ResolvedJavaMethod} for the vmtarget of a java.lang.invoke.MemberName. |
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151 */ |
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152 private static ResolvedJavaMethod getTargetMethod(JavaConstant memberName) { |
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153 if (memberName.isNull()) { |
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154 return null; |
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155 } |
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156 |
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157 Object object = ((HotSpotObjectConstantImpl) memberName).object(); |
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158 /* Read the ResolvedJavaMethod from the injected field MemberName.vmtarget */ |
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159 return compilerToVM().getResolvedJavaMethod(object, LazyInitialization.memberNameVmtargetField.offset()); |
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160 } |
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161 } |