Mercurial > hg > graal-jvmci-8

annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotMethodHandleAccessProvider.java @ 23363:56479400913e

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jdk.vm.ci needs to securely export services (JDK-8155023)
author Doug Simon <doug.simon@oracle.com>
date Thu, 28 Apr 2016 15:16:47 +0200
parents 1bbd4a7c274b
children a920338dd4d4
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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 import static jdk.vm.ci.hotspot.HotSpotResolvedObjectTypeImpl.fromObjectClass;
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28 import jdk.vm.ci.common.JVMCIError;
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29 import jdk.vm.ci.meta.ConstantReflectionProvider;
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30 import jdk.vm.ci.meta.JavaConstant;
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31 import jdk.vm.ci.meta.MethodHandleAccessProvider;
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32 import jdk.vm.ci.meta.ResolvedJavaField;
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33 import jdk.vm.ci.meta.ResolvedJavaMethod;
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34 import jdk.vm.ci.meta.ResolvedJavaType;
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35
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36 public class HotSpotMethodHandleAccessProvider implements MethodHandleAccessProvider, HotSpotProxified {
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37
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38 private final ConstantReflectionProvider constantReflection;
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39
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40 public HotSpotMethodHandleAccessProvider(ConstantReflectionProvider constantReflection) {
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41 this.constantReflection = constantReflection;
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42 }
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43
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44 /**
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45 * Lazy initialization to break class initialization cycle. Field and method lookup is only
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46 * possible after the {@link HotSpotJVMCIRuntime} is fully initialized.
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47 */
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48 static class LazyInitialization {
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49 static final ResolvedJavaField methodHandleFormField;
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50 static final ResolvedJavaField lambdaFormVmentryField;
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51 static final ResolvedJavaMethod lambdaFormCompileToBytecodeMethod;
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52 static final HotSpotResolvedJavaField memberNameVmtargetField;
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53
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54 /**
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55 * Search for an instance field with the given name in a class.
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56 *
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57 * @param className name of the class to search in
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58 * @param fieldName name of the field to be searched
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59 * @return resolved java field
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60 * @throws ClassNotFoundException
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61 */
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62 private static ResolvedJavaField findFieldInClass(String className, String fieldName) throws ClassNotFoundException {
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63 Class<?> clazz = Class.forName(className);
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64 ResolvedJavaType type = runtime().fromClass(clazz);
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65 ResolvedJavaField[] fields = type.getInstanceFields(false);
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66 for (ResolvedJavaField field : fields) {
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67 if (field.getName().equals(fieldName)) {
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68 return field;
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69 }
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70 }
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71 return null;
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72 }
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73
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74 private static ResolvedJavaMethod findMethodInClass(String className, String methodName) throws ClassNotFoundException {
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75 Class<?> clazz = Class.forName(className);
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76 HotSpotResolvedObjectTypeImpl type = fromObjectClass(clazz);
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77 ResolvedJavaMethod result = null;
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78 for (ResolvedJavaMethod method : type.getDeclaredMethods()) {
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79 if (method.getName().equals(methodName)) {
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80 assert result == null : "more than one method found: " + className + "." + methodName;
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81 result = method;
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82 }
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83 }
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84 assert result != null : "method not found: " + className + "." + methodName;
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85 return result;
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86 }
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87
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88 static {
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89 try {
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90 methodHandleFormField = findFieldInClass("java.lang.invoke.MethodHandle", "form");
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91 lambdaFormVmentryField = findFieldInClass("java.lang.invoke.LambdaForm", "vmentry");
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92 lambdaFormCompileToBytecodeMethod = findMethodInClass("java.lang.invoke.LambdaForm", "compileToBytecode");
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93 memberNameVmtargetField = (HotSpotResolvedJavaField) findFieldInClass("java.lang.invoke.MemberName", "vmtarget");
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94 } catch (Throwable ex) {
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95 throw new JVMCIError(ex);
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96 }
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97 }
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98 }
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99
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100 @Override
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101 public IntrinsicMethod lookupMethodHandleIntrinsic(ResolvedJavaMethod method) {
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102 int intrinsicId = ((HotSpotResolvedJavaMethodImpl) method).intrinsicId();
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103 if (intrinsicId != 0) {
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104 return getMethodHandleIntrinsic(intrinsicId);
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105 }
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106 return null;
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107 }
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108
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109 public static IntrinsicMethod getMethodHandleIntrinsic(int intrinsicId) {
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110 HotSpotVMConfig config = runtime().getConfig();
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111 if (intrinsicId == config.vmIntrinsicInvokeBasic) {
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112 return IntrinsicMethod.INVOKE_BASIC;
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113 } else if (intrinsicId == config.vmIntrinsicLinkToInterface) {
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114 return IntrinsicMethod.LINK_TO_INTERFACE;
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115 } else if (intrinsicId == config.vmIntrinsicLinkToSpecial) {
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116 return IntrinsicMethod.LINK_TO_SPECIAL;
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117 } else if (intrinsicId == config.vmIntrinsicLinkToStatic) {
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118 return IntrinsicMethod.LINK_TO_STATIC;
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119 } else if (intrinsicId == config.vmIntrinsicLinkToVirtual) {
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120 return IntrinsicMethod.LINK_TO_VIRTUAL;
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121 }
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122 return null;
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123 }
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124
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125 @Override
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126 public ResolvedJavaMethod resolveInvokeBasicTarget(JavaConstant methodHandle, boolean forceBytecodeGeneration) {
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127 if (methodHandle.isNull()) {
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128 return null;
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129 }
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130
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131 /* Load non-public field: LambdaForm MethodHandle.form */
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132 JavaConstant lambdaForm = constantReflection.readFieldValue(LazyInitialization.methodHandleFormField, methodHandle);
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133 if (lambdaForm == null || lambdaForm.isNull()) {
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134 return null;
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135 }
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136
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137 JavaConstant memberName;
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138 if (forceBytecodeGeneration) {
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139 /* Invoke non-public method: MemberName LambdaForm.compileToBytecode() */
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140 memberName = LazyInitialization.lambdaFormCompileToBytecodeMethod.invoke(lambdaForm, new JavaConstant[0]);
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141 } else {
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142 /* Load non-public field: MemberName LambdaForm.vmentry */
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143 memberName = constantReflection.readFieldValue(LazyInitialization.lambdaFormVmentryField, lambdaForm);
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144 }
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145 return getTargetMethod(memberName);
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146 }
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147
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148 @Override
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149 public ResolvedJavaMethod resolveLinkToTarget(JavaConstant memberName) {
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150 return getTargetMethod(memberName);
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151 }
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152
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153 /**
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154 * Returns the {@link ResolvedJavaMethod} for the vmtarget of a java.lang.invoke.MemberName.
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155 */
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156 private static ResolvedJavaMethod getTargetMethod(JavaConstant memberName) {
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157 if (memberName.isNull()) {
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158 return null;
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159 }
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160
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161 Object object = ((HotSpotObjectConstantImpl) memberName).object();
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162 /* Read the ResolvedJavaMethod from the injected field MemberName.vmtarget */
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163 return compilerToVM().getResolvedJavaMethod(object, LazyInitialization.memberNameVmtargetField.offset());
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164 }
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165 }