| /* |
| * Copyright (c) 2010, 2013, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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. |
| */ |
| |
| /* |
| * This file is available under and governed by the GNU General Public |
| * License version 2 only, as published by the Free Software Foundation. |
| * However, the following notice accompanied the original version of this |
| * file, and Oracle licenses the original version of this file under the BSD |
| * license: |
| */ |
| /* |
| Copyright 2009-2013 Attila Szegedi |
| |
| Licensed under both the Apache License, Version 2.0 (the "Apache License") |
| and the BSD License (the "BSD License"), with licensee being free to |
| choose either of the two at their discretion. |
| |
| You may not use this file except in compliance with either the Apache |
| License or the BSD License. |
| |
| If you choose to use this file in compliance with the Apache License, the |
| following notice applies to you: |
| |
| You may obtain a copy of the Apache License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
| implied. See the License for the specific language governing |
| permissions and limitations under the License. |
| |
| If you choose to use this file in compliance with the BSD License, the |
| following notice applies to you: |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions are |
| met: |
| * Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| * Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| * Neither the name of the copyright holder nor the names of |
| contributors may be used to endorse or promote products derived from |
| this software without specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
| PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER |
| BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package jdk.internal.dynalink; |
| |
| import java.lang.invoke.CallSite; |
| import java.lang.invoke.MethodHandle; |
| import java.lang.invoke.MutableCallSite; |
| import java.lang.invoke.VolatileCallSite; |
| import jdk.internal.dynalink.linker.GuardedInvocation; |
| |
| /** |
| * Interface for relinkable call sites. Language runtimes wishing to use this framework must use subclasses of |
| * {@link CallSite} that also implement this interface as their call sites. There is a readily usable |
| * {@link MonomorphicCallSite} subclass that implements monomorphic inline caching strategy as well as a |
| * {@link ChainedCallSite} that retains a chain of already linked method handles. The reason this is defined as an |
| * interface instead of a concrete, albeit abstract class is that it allows independent implementations to choose |
| * between {@link MutableCallSite} and {@link VolatileCallSite} as they see fit. |
| * |
| * @author Attila Szegedi |
| */ |
| public interface RelinkableCallSite { |
| /** |
| * Initializes the relinkable call site by setting a relink-and-invoke method handle. The call site implementation |
| * is supposed to set this method handle as its target. |
| * @param relinkAndInvoke a relink-and-invoke method handle supplied by the {@link DynamicLinker}. |
| */ |
| public void initialize(MethodHandle relinkAndInvoke); |
| |
| /** |
| * Returns the descriptor for this call site. |
| * |
| * @return the descriptor for this call site. |
| */ |
| public CallSiteDescriptor getDescriptor(); |
| |
| /** |
| * This method will be called by the dynamic linker every time the call site is normally relinked. It will be passed |
| * a {@code GuardedInvocation} that the call site should incorporate into its target method handle. When this method |
| * is called, the call site is allowed to keep other non-invalidated invocations around for implementation of |
| * polymorphic inline caches and compose them with this invocation to form its final target. |
| * |
| * @param guardedInvocation the guarded invocation that the call site should incorporate into its target method |
| * handle. |
| * @param fallback the fallback method. This is a method matching the method type of the call site that is supplied |
| * by the {@link DynamicLinker} to be used by this call site as a fallback when it can't invoke its target with the |
| * passed arguments. The fallback method is such that when it's invoked, it'll try to discover the adequate target |
| * for the invocation, subsequently invoke {@link #relink(GuardedInvocation, MethodHandle)} or |
| * {@link #resetAndRelink(GuardedInvocation, MethodHandle)}, and finally invoke the target. |
| */ |
| public void relink(GuardedInvocation guardedInvocation, MethodHandle fallback); |
| |
| /** |
| * This method will be called by the dynamic linker every time the call site is relinked and the linker wishes the |
| * call site to throw away any prior linkage state. It will be passed a {@code GuardedInvocation} that the call site |
| * should use to build its target method handle. When this method is called, the call site is discouraged from |
| * keeping previous state around, and is supposed to only link the current invocation. |
| * |
| * @param guardedInvocation the guarded invocation that the call site should use to build its target method handle. |
| * @param fallback the fallback method. This is a method matching the method type of the call site that is supplied |
| * by the {@link DynamicLinker} to be used by this call site as a fallback when it can't invoke its target with the |
| * passed arguments. The fallback method is such that when it's invoked, it'll try to discover the adequate target |
| * for the invocation, subsequently invoke {@link #relink(GuardedInvocation, MethodHandle)} or |
| * {@link #resetAndRelink(GuardedInvocation, MethodHandle)}, and finally invoke the target. |
| */ |
| public void resetAndRelink(GuardedInvocation guardedInvocation, MethodHandle fallback); |
| } |