1 /* 2 * Copyright (c) 2014, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package jdk.vm.ci.meta; 24 25 import java.lang.invoke.MethodHandle; 26 27 /** 28 * Interface to access the internals of the {@link MethodHandle} implementation of the VM. An 29 * implementation of this interface is usually required to access non-public classes, methods, and 30 * fields of {@link MethodHandle}, i.e., data that is not standardized by the Java specification. 31 */ 32 public interface MethodHandleAccessProvider { 33 34 /** 35 * Identification for methods defined on the class {@link MethodHandle} that are processed by 36 * the {@link MethodHandleAccessProvider}. 37 */ 38 enum IntrinsicMethod { 39 /** The method {@code MethodHandle.invokeBasic}. */ 40 INVOKE_BASIC, 41 /** The method {@code MethodHandle.linkToStatic}. */ 42 LINK_TO_STATIC, 43 /** The method {@code MethodHandle.linkToSpecial}. */ 44 LINK_TO_SPECIAL, 45 /** The method {@code MethodHandle.linkToVirtual}. */ 46 LINK_TO_VIRTUAL, 47 /** The method {@code MethodHandle.linkToInterface}. */ 48 LINK_TO_INTERFACE 49 } 50 51 /** 52 * Returns the method handle method intrinsic identifier for the provided method, or 53 * {@code null} if the method is not an intrinsic processed by this interface. 54 * 55 * @throws NullPointerException if {@code method} is null 56 */ lookupMethodHandleIntrinsic(ResolvedJavaMethod method)57 IntrinsicMethod lookupMethodHandleIntrinsic(ResolvedJavaMethod method); 58 59 /** 60 * Resolves the invocation target for an invocation of {@link IntrinsicMethod#INVOKE_BASIC 61 * MethodHandle.invokeBasic} with the given constant receiver {@link MethodHandle}. Returns 62 * {@code null} if the invocation target is not available at this time. 63 * 64 * The first invocations of a method handle can use an interpreter to lookup the actual invoked 65 * method; frequently executed method handles can use Java bytecode generation to avoid the 66 * interpreter overhead. If the parameter forceBytecodeGeneration is set to true, the VM should 67 * try to generate bytecodes before this method returns. 68 * 69 * @returns {@code null} if {@code methodHandle} is not a {@link MethodHandle} or the invocation 70 * target is not available at this time 71 * @throws NullPointerException if {@code methodHandle} is null 72 */ resolveInvokeBasicTarget(JavaConstant methodHandle, boolean forceBytecodeGeneration)73 ResolvedJavaMethod resolveInvokeBasicTarget(JavaConstant methodHandle, boolean forceBytecodeGeneration); 74 75 /** 76 * Resolves the invocation target for an invocation of a {@code MethodHandle.linkTo*} method 77 * with the given constant member name. The member name is the last parameter of the 78 * {@code linkTo*} method. 79 * 80 * @returns {@code null} if the invocation target is not available at this time 81 * @throws NullPointerException if {@code memberName} is null 82 * @throws IllegalArgumentException if {@code memberName} is not a 83 * {@code java.lang.invoke.MemberName} 84 */ resolveLinkToTarget(JavaConstant memberName)85 ResolvedJavaMethod resolveLinkToTarget(JavaConstant memberName); 86 } 87