| /* |
| * 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.linker; |
| |
| /** |
| * The base interface for language-specific dynamic linkers. Such linkers always have to produce method handles with |
| * guards, as the validity of the method handle for calls at a call site inevitably depends on some condition (at the |
| * very least, it depends on the receiver belonging to the language runtime of the linker). Language runtime |
| * implementors will normally implement one for their own language, and declare it in the |
| * <tt>META-INF/services/jdk.internal.dynalink.linker.GuardingDynamicLinker</tt> file within their JAR file. |
| * |
| * @author Attila Szegedi |
| */ |
| public interface GuardingDynamicLinker { |
| /** |
| * Creates a guarded invocation appropriate for a particular invocation with the specified arguments at a call site. |
| * |
| * @param linkRequest the object describing the request for linking a particular invocation |
| * @param linkerServices linker services |
| * @return a guarded invocation with a method handle suitable for the arguments, as well as a guard condition that |
| * if fails should trigger relinking. Must return null if it can't resolve the invocation. If the returned |
| * invocation is unconditional (which is actually quite rare), the guard in the return value can be null. The |
| * invocation can also have a switch point for asynchronous invalidation of the linkage, as well as a |
| * {@link Throwable} subclass that describes an expected exception condition that also triggers relinking (often it |
| * is faster to rely on an infrequent but expected {@link ClassCastException} than on an always evaluated |
| * {@code instanceof} guard). If the linker does not recognize any native language runtime contexts in arguments, or |
| * does recognize its own, but receives a call site descriptor without its recognized context in the arguments, it |
| * should invoke {@link LinkRequest#withoutRuntimeContext()} and link for that. While the linker must produce an |
| * invocation with parameter types matching those in the call site descriptor of the link request, it should not try |
| * to match the return type expected at the call site except when it can do it with only the conversions that lose |
| * neither precision nor magnitude, see {@link LinkerServices#asTypeLosslessReturn(java.lang.invoke.MethodHandle, |
| * java.lang.invoke.MethodType)}. |
| * @throws Exception if the operation fails for whatever reason |
| */ |
| public GuardedInvocation getGuardedInvocation(LinkRequest linkRequest, LinkerServices linkerServices) |
| throws Exception; |
| } |