1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000 1.2 +++ b/src/jdk/internal/dynalink/RelinkableCallSite.java Wed Apr 27 01:36:41 2016 +0800 1.3 @@ -0,0 +1,147 @@ 1.4 +/* 1.5 + * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. 1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 1.7 + * 1.8 + * This code is free software; you can redistribute it and/or modify it 1.9 + * under the terms of the GNU General Public License version 2 only, as 1.10 + * published by the Free Software Foundation. Oracle designates this 1.11 + * particular file as subject to the "Classpath" exception as provided 1.12 + * by Oracle in the LICENSE file that accompanied this code. 1.13 + * 1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT 1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1.17 + * version 2 for more details (a copy is included in the LICENSE file that 1.18 + * accompanied this code). 1.19 + * 1.20 + * You should have received a copy of the GNU General Public License version 1.21 + * 2 along with this work; if not, write to the Free Software Foundation, 1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 1.23 + * 1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 1.25 + * or visit www.oracle.com if you need additional information or have any 1.26 + * questions. 1.27 + */ 1.28 + 1.29 +/* 1.30 + * This file is available under and governed by the GNU General Public 1.31 + * License version 2 only, as published by the Free Software Foundation. 1.32 + * However, the following notice accompanied the original version of this 1.33 + * file, and Oracle licenses the original version of this file under the BSD 1.34 + * license: 1.35 + */ 1.36 +/* 1.37 + Copyright 2009-2013 Attila Szegedi 1.38 + 1.39 + Licensed under both the Apache License, Version 2.0 (the "Apache License") 1.40 + and the BSD License (the "BSD License"), with licensee being free to 1.41 + choose either of the two at their discretion. 1.42 + 1.43 + You may not use this file except in compliance with either the Apache 1.44 + License or the BSD License. 1.45 + 1.46 + If you choose to use this file in compliance with the Apache License, the 1.47 + following notice applies to you: 1.48 + 1.49 + You may obtain a copy of the Apache License at 1.50 + 1.51 + http://www.apache.org/licenses/LICENSE-2.0 1.52 + 1.53 + Unless required by applicable law or agreed to in writing, software 1.54 + distributed under the License is distributed on an "AS IS" BASIS, 1.55 + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 1.56 + implied. See the License for the specific language governing 1.57 + permissions and limitations under the License. 1.58 + 1.59 + If you choose to use this file in compliance with the BSD License, the 1.60 + following notice applies to you: 1.61 + 1.62 + Redistribution and use in source and binary forms, with or without 1.63 + modification, are permitted provided that the following conditions are 1.64 + met: 1.65 + * Redistributions of source code must retain the above copyright 1.66 + notice, this list of conditions and the following disclaimer. 1.67 + * Redistributions in binary form must reproduce the above copyright 1.68 + notice, this list of conditions and the following disclaimer in the 1.69 + documentation and/or other materials provided with the distribution. 1.70 + * Neither the name of the copyright holder nor the names of 1.71 + contributors may be used to endorse or promote products derived from 1.72 + this software without specific prior written permission. 1.73 + 1.74 + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 1.75 + IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 1.76 + TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 1.77 + PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER 1.78 + BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 1.79 + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 1.80 + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 1.81 + BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 1.82 + WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 1.83 + OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 1.84 + ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 1.85 +*/ 1.86 + 1.87 +package jdk.internal.dynalink; 1.88 + 1.89 +import java.lang.invoke.CallSite; 1.90 +import java.lang.invoke.MethodHandle; 1.91 +import java.lang.invoke.MutableCallSite; 1.92 +import java.lang.invoke.VolatileCallSite; 1.93 +import jdk.internal.dynalink.linker.GuardedInvocation; 1.94 + 1.95 +/** 1.96 + * Interface for relinkable call sites. Language runtimes wishing to use this framework must use subclasses of 1.97 + * {@link CallSite} that also implement this interface as their call sites. There is a readily usable 1.98 + * {@link MonomorphicCallSite} subclass that implements monomorphic inline caching strategy as well as a 1.99 + * {@link ChainedCallSite} that retains a chain of already linked method handles. The reason this is defined as an 1.100 + * interface instead of a concrete, albeit abstract class is that it allows independent implementations to choose 1.101 + * between {@link MutableCallSite} and {@link VolatileCallSite} as they see fit. 1.102 + * 1.103 + * @author Attila Szegedi 1.104 + */ 1.105 +public interface RelinkableCallSite { 1.106 + /** 1.107 + * Initializes the relinkable call site by setting a relink-and-invoke method handle. The call site implementation 1.108 + * is supposed to set this method handle as its target. 1.109 + * @param relinkAndInvoke a relink-and-invoke method handle supplied by the {@link DynamicLinker}. 1.110 + */ 1.111 + public void initialize(MethodHandle relinkAndInvoke); 1.112 + 1.113 + /** 1.114 + * Returns the descriptor for this call site. 1.115 + * 1.116 + * @return the descriptor for this call site. 1.117 + */ 1.118 + public CallSiteDescriptor getDescriptor(); 1.119 + 1.120 + /** 1.121 + * This method will be called by the dynamic linker every time the call site is normally relinked. It will be passed 1.122 + * a {@code GuardedInvocation} that the call site should incorporate into its target method handle. When this method 1.123 + * is called, the call site is allowed to keep other non-invalidated invocations around for implementation of 1.124 + * polymorphic inline caches and compose them with this invocation to form its final target. 1.125 + * 1.126 + * @param guardedInvocation the guarded invocation that the call site should incorporate into its target method 1.127 + * handle. 1.128 + * @param fallback the fallback method. This is a method matching the method type of the call site that is supplied 1.129 + * by the {@link DynamicLinker} to be used by this call site as a fallback when it can't invoke its target with the 1.130 + * passed arguments. The fallback method is such that when it's invoked, it'll try to discover the adequate target 1.131 + * for the invocation, subsequently invoke {@link #relink(GuardedInvocation, MethodHandle)} or 1.132 + * {@link #resetAndRelink(GuardedInvocation, MethodHandle)}, and finally invoke the target. 1.133 + */ 1.134 + public void relink(GuardedInvocation guardedInvocation, MethodHandle fallback); 1.135 + 1.136 + /** 1.137 + * This method will be called by the dynamic linker every time the call site is relinked and the linker wishes the 1.138 + * call site to throw away any prior linkage state. It will be passed a {@code GuardedInvocation} that the call site 1.139 + * should use to build its target method handle. When this method is called, the call site is discouraged from 1.140 + * keeping previous state around, and is supposed to only link the current invocation. 1.141 + * 1.142 + * @param guardedInvocation the guarded invocation that the call site should use to build its target method handle. 1.143 + * @param fallback the fallback method. This is a method matching the method type of the call site that is supplied 1.144 + * by the {@link DynamicLinker} to be used by this call site as a fallback when it can't invoke its target with the 1.145 + * passed arguments. The fallback method is such that when it's invoked, it'll try to discover the adequate target 1.146 + * for the invocation, subsequently invoke {@link #relink(GuardedInvocation, MethodHandle)} or 1.147 + * {@link #resetAndRelink(GuardedInvocation, MethodHandle)}, and finally invoke the target. 1.148 + */ 1.149 + public void resetAndRelink(GuardedInvocation guardedInvocation, MethodHandle fallback); 1.150 +}