author | attila |
Mon, 19 Oct 2015 08:45:29 +0200 | |
changeset 33333 | 0bad500ce4e0 |
parent 33332 | f180be6368d8 |
child 33339 | 334cd3ebfa5e |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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/* |
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* This file is available under and governed by the GNU General Public |
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* License version 2 only, as published by the Free Software Foundation. |
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* However, the following notice accompanied the original version of this |
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* file, and Oracle licenses the original version of this file under the BSD |
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* license: |
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*/ |
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/* |
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Copyright 2009-2013 Attila Szegedi |
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|
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Licensed under both the Apache License, Version 2.0 (the "Apache License") |
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and the BSD License (the "BSD License"), with licensee being free to |
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choose either of the two at their discretion. |
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|
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You may not use this file except in compliance with either the Apache |
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License or the BSD License. |
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|
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If you choose to use this file in compliance with the Apache License, the |
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following notice applies to you: |
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|
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You may obtain a copy of the Apache License at |
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|
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http://www.apache.org/licenses/LICENSE-2.0 |
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|
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Unless required by applicable law or agreed to in writing, software |
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distributed under the License is distributed on an "AS IS" BASIS, |
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
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implied. See the License for the specific language governing |
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permissions and limitations under the License. |
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|
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If you choose to use this file in compliance with the BSD License, the |
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following notice applies to you: |
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|
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Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions are |
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met: |
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* Redistributions of source code must retain the above copyright |
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notice, this list of conditions and the following disclaimer. |
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* Redistributions in binary form must reproduce the above copyright |
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notice, this list of conditions and the following disclaimer in the |
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documentation and/or other materials provided with the distribution. |
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* Neither the name of the copyright holder nor the names of |
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contributors may be used to endorse or promote products derived from |
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this software without specific prior written permission. |
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|
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER |
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BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
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BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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package jdk.internal.dynalink.linker; |
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/** |
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* The base interface for language-specific dynamic linkers. Such linkers always have to produce method handles with |
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* guards, as the validity of the method handle for calls at a call site inevitably depends on some condition (at the |
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* very least, it depends on the receiver belonging to the language runtime of the linker). Language runtime |
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* implementors will normally implement one for their own language, and declare it in the |
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* <tt>META-INF/services/jdk.internal.dynalink.linker.GuardingDynamicLinker</tt> file within their JAR file. |
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*/ |
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public interface GuardingDynamicLinker { |
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/** |
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* Creates a guarded invocation appropriate for a particular invocation with the specified arguments at a call site. |
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* |
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* @param linkRequest the object describing the request for linking a particular invocation |
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* @param linkerServices linker services |
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* @return a guarded invocation with a method handle suitable for the arguments, as well as a guard condition that |
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* if fails should trigger relinking. Must return null if it can't resolve the invocation. If the returned |
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* invocation is unconditional (which is actually quite rare), the guard in the return value can be null. The |
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* invocation can also have any number of switch points for asynchronous invalidation of the linkage, as well as a |
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* {@link Throwable} subclass that describes an expected exception condition that also triggers relinking (often it |
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* is faster to rely on an infrequent but expected {@link ClassCastException} than on an always evaluated |
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* {@code instanceof} guard). While the linker must produce an |
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* invocation with parameter types matching those in the call site descriptor of the link request, it should not try |
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* to match the return type expected at the call site except when it can do it with only the conversions that lose |
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* neither precision nor magnitude, see {@link LinkerServices#asTypeLosslessReturn(java.lang.invoke.MethodHandle, |
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* java.lang.invoke.MethodType)} for further explanation. |
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* @throws Exception if the operation fails for whatever reason |
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*/ |
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public GuardedInvocation getGuardedInvocation(LinkRequest linkRequest, LinkerServices linkerServices) |
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throws Exception; |
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} |