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annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotMethodHandleAccessProvider.java @ 23749:d6bd0b9cd0b6

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remove uses of setAccessible (JDK-8165434)
author Doug Simon <doug.simon@oracle.com>
date Wed, 07 Sep 2016 15:17:13 +0200
parents 1d4ce2d19e52
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 }