| /* |
| * Copyright (c) 2014, 2014, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package jdk.vm.ci.hotspot; |
| |
| import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.*; |
| import static jdk.vm.ci.hotspot.HotSpotResolvedObjectTypeImpl.*; |
| |
| import jdk.vm.ci.common.*; |
| import jdk.vm.ci.meta.*; |
| |
| public class HotSpotMethodHandleAccessProvider implements MethodHandleAccessProvider, HotSpotProxified { |
| |
| private final ConstantReflectionProvider constantReflection; |
| |
| public HotSpotMethodHandleAccessProvider(ConstantReflectionProvider constantReflection) { |
| this.constantReflection = constantReflection; |
| } |
| |
| /** |
| * Lazy initialization to break class initialization cycle. Field and method lookup is only |
| * possible after the {@link HotSpotJVMCIRuntime} is fully initialized. |
| */ |
| static class LazyInitialization { |
| static final ResolvedJavaField methodHandleFormField; |
| static final ResolvedJavaField lambdaFormVmentryField; |
| static final ResolvedJavaMethod lambdaFormCompileToBytecodeMethod; |
| static final HotSpotResolvedJavaField memberNameVmtargetField; |
| |
| /** |
| * Search for an instance field with the given name in a class. |
| * |
| * @param className name of the class to search in |
| * @param fieldName name of the field to be searched |
| * @return resolved java field |
| * @throws ClassNotFoundException |
| */ |
| private static ResolvedJavaField findFieldInClass(String className, String fieldName) throws ClassNotFoundException { |
| Class<?> clazz = Class.forName(className); |
| ResolvedJavaType type = runtime().fromClass(clazz); |
| ResolvedJavaField[] fields = type.getInstanceFields(false); |
| for (ResolvedJavaField field : fields) { |
| if (field.getName().equals(fieldName)) { |
| return field; |
| } |
| } |
| return null; |
| } |
| |
| private static ResolvedJavaMethod findMethodInClass(String className, String methodName) throws ClassNotFoundException { |
| Class<?> clazz = Class.forName(className); |
| HotSpotResolvedObjectTypeImpl type = fromObjectClass(clazz); |
| ResolvedJavaMethod result = null; |
| for (ResolvedJavaMethod method : type.getDeclaredMethods()) { |
| if (method.getName().equals(methodName)) { |
| assert result == null : "more than one method found: " + className + "." + methodName; |
| result = method; |
| } |
| } |
| assert result != null : "method not found: " + className + "." + methodName; |
| return result; |
| } |
| |
| static { |
| try { |
| methodHandleFormField = findFieldInClass("java.lang.invoke.MethodHandle", "form"); |
| lambdaFormVmentryField = findFieldInClass("java.lang.invoke.LambdaForm", "vmentry"); |
| lambdaFormCompileToBytecodeMethod = findMethodInClass("java.lang.invoke.LambdaForm", "compileToBytecode"); |
| memberNameVmtargetField = (HotSpotResolvedJavaField) findFieldInClass("java.lang.invoke.MemberName", "vmtarget"); |
| } catch (Throwable ex) { |
| throw new JVMCIError(ex); |
| } |
| } |
| } |
| |
| @Override |
| public IntrinsicMethod lookupMethodHandleIntrinsic(ResolvedJavaMethod method) { |
| int intrinsicId = ((HotSpotResolvedJavaMethodImpl) method).intrinsicId(); |
| if (intrinsicId != 0) { |
| return getMethodHandleIntrinsic(intrinsicId); |
| } |
| return null; |
| } |
| |
| public static IntrinsicMethod getMethodHandleIntrinsic(int intrinsicId) { |
| HotSpotVMConfig config = runtime().getConfig(); |
| if (intrinsicId == config.vmIntrinsicInvokeBasic) { |
| return IntrinsicMethod.INVOKE_BASIC; |
| } else if (intrinsicId == config.vmIntrinsicLinkToInterface) { |
| return IntrinsicMethod.LINK_TO_INTERFACE; |
| } else if (intrinsicId == config.vmIntrinsicLinkToSpecial) { |
| return IntrinsicMethod.LINK_TO_SPECIAL; |
| } else if (intrinsicId == config.vmIntrinsicLinkToStatic) { |
| return IntrinsicMethod.LINK_TO_STATIC; |
| } else if (intrinsicId == config.vmIntrinsicLinkToVirtual) { |
| return IntrinsicMethod.LINK_TO_VIRTUAL; |
| } |
| return null; |
| } |
| |
| @Override |
| public ResolvedJavaMethod resolveInvokeBasicTarget(JavaConstant methodHandle, boolean forceBytecodeGeneration) { |
| if (methodHandle.isNull()) { |
| return null; |
| } |
| |
| /* Load non-public field: LambdaForm MethodHandle.form */ |
| JavaConstant lambdaForm = constantReflection.readFieldValue(LazyInitialization.methodHandleFormField, methodHandle); |
| if (lambdaForm.isNull()) { |
| return null; |
| } |
| |
| JavaConstant memberName; |
| if (forceBytecodeGeneration) { |
| /* Invoke non-public method: MemberName LambdaForm.compileToBytecode() */ |
| memberName = LazyInitialization.lambdaFormCompileToBytecodeMethod.invoke(lambdaForm, new JavaConstant[0]); |
| } else { |
| /* Load non-public field: MemberName LambdaForm.vmentry */ |
| memberName = constantReflection.readFieldValue(LazyInitialization.lambdaFormVmentryField, lambdaForm); |
| } |
| return getTargetMethod(memberName); |
| } |
| |
| @Override |
| public ResolvedJavaMethod resolveLinkToTarget(JavaConstant memberName) { |
| return getTargetMethod(memberName); |
| } |
| |
| /** |
| * Returns the {@link ResolvedJavaMethod} for the vmtarget of a java.lang.invoke.MemberName. |
| */ |
| private static ResolvedJavaMethod getTargetMethod(JavaConstant memberName) { |
| if (memberName.isNull()) { |
| return null; |
| } |
| |
| Object object = ((HotSpotObjectConstantImpl) memberName).object(); |
| /* Read the ResolvedJavaMethod from the injected field MemberName.vmtarget */ |
| return runtime().compilerToVm.getResolvedJavaMethod(object, LazyInitialization.memberNameVmtargetField.offset()); |
| } |
| } |