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annotate graal/com.oracle.jvmci.hotspot/src/com/oracle/jvmci/hotspot/HotSpotMethodHandleAccessProvider.java @ 21738:28943e5044b5
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author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Thu, 04 Jun 2015 19:49:45 -0700 |
parents | 48c1ebd24120 |
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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 com.oracle.jvmci.hotspot; |
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24 |
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25 import static com.oracle.jvmci.hotspot.HotSpotJVMCIRuntime.*; |
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26 import static com.oracle.jvmci.hotspot.HotSpotResolvedJavaType.*; |
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27 import static com.oracle.jvmci.hotspot.HotSpotResolvedObjectTypeImpl.*; |
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28 |
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29 import com.oracle.jvmci.common.*; |
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30 import com.oracle.jvmci.meta.*; |
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31 |
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32 public class HotSpotMethodHandleAccessProvider implements MethodHandleAccessProvider, HotSpotProxified { |
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33 |
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34 private final ConstantReflectionProvider constantReflection; |
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35 |
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36 public HotSpotMethodHandleAccessProvider(ConstantReflectionProvider constantReflection) { |
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37 this.constantReflection = constantReflection; |
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38 } |
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39 |
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40 /** |
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41 * Lazy initialization to break class initialization cycle. Field and method lookup is only |
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42 * possible after the {@link HotSpotJVMCIRuntime} is fully initialized. |
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43 */ |
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44 static class LazyInitialization { |
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45 static final ResolvedJavaField methodHandleFormField; |
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46 static final ResolvedJavaField lambdaFormVmentryField; |
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47 static final ResolvedJavaMethod lambdaFormCompileToBytecodeMethod; |
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48 static final ResolvedJavaField memberNameVmtargetField; |
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49 |
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50 /** |
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51 * Search for an instance field with the given name in a class. |
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52 * |
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53 * @param className name of the class to search in |
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54 * @param fieldName name of the field to be searched |
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55 * @return resolved java field |
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56 * @throws ClassNotFoundException |
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57 */ |
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58 private static ResolvedJavaField findFieldInClass(String className, String fieldName) throws ClassNotFoundException { |
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59 Class<?> clazz = Class.forName(className); |
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60 ResolvedJavaType type = fromClass(clazz); |
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61 ResolvedJavaField[] fields = type.getInstanceFields(false); |
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62 for (ResolvedJavaField field : fields) { |
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63 if (field.getName().equals(fieldName)) { |
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64 return field; |
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65 } |
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66 } |
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67 return null; |
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68 } |
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69 |
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70 private static ResolvedJavaMethod findMethodInClass(String className, String methodName) throws ClassNotFoundException { |
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71 Class<?> clazz = Class.forName(className); |
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72 HotSpotResolvedObjectTypeImpl type = fromObjectClass(clazz); |
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73 ResolvedJavaMethod result = null; |
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74 for (ResolvedJavaMethod method : type.getDeclaredMethods()) { |
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75 if (method.getName().equals(methodName)) { |
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76 assert result == null : "more than one method found: " + className + "." + methodName; |
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77 result = method; |
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78 } |
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79 } |
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80 assert result != null : "method not found: " + className + "." + methodName; |
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81 return result; |
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82 } |
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83 |
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84 static { |
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85 try { |
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86 methodHandleFormField = findFieldInClass("java.lang.invoke.MethodHandle", "form"); |
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87 lambdaFormVmentryField = findFieldInClass("java.lang.invoke.LambdaForm", "vmentry"); |
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88 lambdaFormCompileToBytecodeMethod = findMethodInClass("java.lang.invoke.LambdaForm", "compileToBytecode"); |
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89 memberNameVmtargetField = findFieldInClass("java.lang.invoke.MemberName", "vmtarget"); |
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90 } catch (Throwable ex) { |
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91 throw new JVMCIError(ex); |
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92 } |
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93 } |
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94 } |
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95 |
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96 @Override |
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97 public IntrinsicMethod lookupMethodHandleIntrinsic(ResolvedJavaMethod method) { |
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98 int intrinsicId = ((HotSpotResolvedJavaMethodImpl) method).intrinsicId(); |
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99 if (intrinsicId != 0) { |
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100 return getMethodHandleIntrinsic(intrinsicId); |
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101 } |
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102 return null; |
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103 } |
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104 |
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105 public static IntrinsicMethod getMethodHandleIntrinsic(int intrinsicId) { |
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106 HotSpotVMConfig config = runtime().getConfig(); |
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107 if (intrinsicId == config.vmIntrinsicInvokeBasic) { |
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108 return IntrinsicMethod.INVOKE_BASIC; |
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109 } else if (intrinsicId == config.vmIntrinsicLinkToInterface) { |
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110 return IntrinsicMethod.LINK_TO_INTERFACE; |
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111 } else if (intrinsicId == config.vmIntrinsicLinkToSpecial) { |
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112 return IntrinsicMethod.LINK_TO_SPECIAL; |
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113 } else if (intrinsicId == config.vmIntrinsicLinkToStatic) { |
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114 return IntrinsicMethod.LINK_TO_STATIC; |
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115 } else if (intrinsicId == config.vmIntrinsicLinkToVirtual) { |
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116 return IntrinsicMethod.LINK_TO_VIRTUAL; |
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117 } |
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118 return null; |
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119 } |
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120 |
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121 @Override |
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122 public ResolvedJavaMethod resolveInvokeBasicTarget(JavaConstant methodHandle, boolean forceBytecodeGeneration) { |
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123 if (methodHandle.isNull()) { |
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124 return null; |
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125 } |
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126 |
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127 /* Load non-public field: LambdaForm MethodHandle.form */ |
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128 JavaConstant lambdaForm = constantReflection.readFieldValue(LazyInitialization.methodHandleFormField, methodHandle); |
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129 if (lambdaForm.isNull()) { |
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130 return null; |
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131 } |
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132 |
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133 JavaConstant memberName; |
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134 if (forceBytecodeGeneration) { |
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135 /* Invoke non-public method: MemberName LambdaForm.compileToBytecode() */ |
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136 memberName = LazyInitialization.lambdaFormCompileToBytecodeMethod.invoke(lambdaForm, new JavaConstant[0]); |
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137 } else { |
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138 /* Load non-public field: MemberName LambdaForm.vmentry */ |
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139 memberName = constantReflection.readFieldValue(LazyInitialization.lambdaFormVmentryField, lambdaForm); |
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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 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 /* Load injected field: JVM_Method* MemberName.vmtarget */ |
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158 JavaConstant vmtarget = constantReflection.readFieldValue(LazyInitialization.memberNameVmtargetField, memberName); |
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159 /* Create a method from the vmtarget method pointer. */ |
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160 return HotSpotResolvedJavaMethodImpl.fromMetaspace(vmtarget.asLong()); |
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161 } |
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162 } |