Mercurial > jdk8-mips64-public > nashorn / annotate
src/jdk/internal/dynalink/linker/LinkerServices.java@b1a7da25b547 (annotated)
src/jdk/internal/dynalink/linker/LinkerServices.java
Wed, 27 Apr 2016 01:36:41 +0800
- author
- aoqi
- date
- Wed, 27 Apr 2016 01:36:41 +0800
- changeset 0
- b1a7da25b547
- child 952
- 6d5471a497fb
- permissions
- -rw-r--r--
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http://hg.openjdk.java.net/jdk8u/jdk8u/nashorn/
changeset: 1034:4b9cc65dd24d
tag: jdk8u25-b17
| aoqi@0 | 1 | /* |
| aoqi@0 | 2 | * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
| aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| aoqi@0 | 4 | * |
| aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
| aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| aoqi@0 | 7 | * published by the Free Software Foundation. Oracle designates this |
| aoqi@0 | 8 | * particular file as subject to the "Classpath" exception as provided |
| aoqi@0 | 9 | * by Oracle in the LICENSE file that accompanied this code. |
| aoqi@0 | 10 | * |
| aoqi@0 | 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| aoqi@0 | 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| aoqi@0 | 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| aoqi@0 | 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| aoqi@0 | 15 | * accompanied this code). |
| aoqi@0 | 16 | * |
| aoqi@0 | 17 | * You should have received a copy of the GNU General Public License version |
| aoqi@0 | 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| aoqi@0 | 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| aoqi@0 | 20 | * |
| aoqi@0 | 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| aoqi@0 | 22 | * or visit www.oracle.com if you need additional information or have any |
| aoqi@0 | 23 | * questions. |
| aoqi@0 | 24 | */ |
| aoqi@0 | 25 | |
| aoqi@0 | 26 | /* |
| aoqi@0 | 27 | * This file is available under and governed by the GNU General Public |
| aoqi@0 | 28 | * License version 2 only, as published by the Free Software Foundation. |
| aoqi@0 | 29 | * However, the following notice accompanied the original version of this |
| aoqi@0 | 30 | * file, and Oracle licenses the original version of this file under the BSD |
| aoqi@0 | 31 | * license: |
| aoqi@0 | 32 | */ |
| aoqi@0 | 33 | /* |
| aoqi@0 | 34 | Copyright 2009-2013 Attila Szegedi |
| aoqi@0 | 35 | |
| aoqi@0 | 36 | Licensed under both the Apache License, Version 2.0 (the "Apache License") |
| aoqi@0 | 37 | and the BSD License (the "BSD License"), with licensee being free to |
| aoqi@0 | 38 | choose either of the two at their discretion. |
| aoqi@0 | 39 | |
| aoqi@0 | 40 | You may not use this file except in compliance with either the Apache |
| aoqi@0 | 41 | License or the BSD License. |
| aoqi@0 | 42 | |
| aoqi@0 | 43 | If you choose to use this file in compliance with the Apache License, the |
| aoqi@0 | 44 | following notice applies to you: |
| aoqi@0 | 45 | |
| aoqi@0 | 46 | You may obtain a copy of the Apache License at |
| aoqi@0 | 47 | |
| aoqi@0 | 48 | http://www.apache.org/licenses/LICENSE-2.0 |
| aoqi@0 | 49 | |
| aoqi@0 | 50 | Unless required by applicable law or agreed to in writing, software |
| aoqi@0 | 51 | distributed under the License is distributed on an "AS IS" BASIS, |
| aoqi@0 | 52 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
| aoqi@0 | 53 | implied. See the License for the specific language governing |
| aoqi@0 | 54 | permissions and limitations under the License. |
| aoqi@0 | 55 | |
| aoqi@0 | 56 | If you choose to use this file in compliance with the BSD License, the |
| aoqi@0 | 57 | following notice applies to you: |
| aoqi@0 | 58 | |
| aoqi@0 | 59 | Redistribution and use in source and binary forms, with or without |
| aoqi@0 | 60 | modification, are permitted provided that the following conditions are |
| aoqi@0 | 61 | met: |
| aoqi@0 | 62 | * Redistributions of source code must retain the above copyright |
| aoqi@0 | 63 | notice, this list of conditions and the following disclaimer. |
| aoqi@0 | 64 | * Redistributions in binary form must reproduce the above copyright |
| aoqi@0 | 65 | notice, this list of conditions and the following disclaimer in the |
| aoqi@0 | 66 | documentation and/or other materials provided with the distribution. |
| aoqi@0 | 67 | * Neither the name of the copyright holder nor the names of |
| aoqi@0 | 68 | contributors may be used to endorse or promote products derived from |
| aoqi@0 | 69 | this software without specific prior written permission. |
| aoqi@0 | 70 | |
| aoqi@0 | 71 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| aoqi@0 | 72 | IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| aoqi@0 | 73 | TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
| aoqi@0 | 74 | PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER |
| aoqi@0 | 75 | BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| aoqi@0 | 76 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| aoqi@0 | 77 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| aoqi@0 | 78 | BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| aoqi@0 | 79 | WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| aoqi@0 | 80 | OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| aoqi@0 | 81 | ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| aoqi@0 | 82 | */ |
| aoqi@0 | 83 | |
| aoqi@0 | 84 | package jdk.internal.dynalink.linker; |
| aoqi@0 | 85 | |
| aoqi@0 | 86 | import java.lang.invoke.MethodHandle; |
| aoqi@0 | 87 | import java.lang.invoke.MethodHandles; |
| aoqi@0 | 88 | import java.lang.invoke.MethodType; |
| aoqi@0 | 89 | import jdk.internal.dynalink.DynamicLinker; |
| aoqi@0 | 90 | import jdk.internal.dynalink.linker.ConversionComparator.Comparison; |
| aoqi@0 | 91 | |
| aoqi@0 | 92 | /** |
| aoqi@0 | 93 | * Interface for services provided to {@link GuardingDynamicLinker} instances by the {@link DynamicLinker} that owns |
| aoqi@0 | 94 | * them. You can think of it as the interface of the {@link DynamicLinker} that faces the {@link GuardingDynamicLinker} |
| aoqi@0 | 95 | * s. |
| aoqi@0 | 96 | * |
| aoqi@0 | 97 | * @author Attila Szegedi |
| aoqi@0 | 98 | */ |
| aoqi@0 | 99 | public interface LinkerServices { |
| aoqi@0 | 100 | /** |
| aoqi@0 | 101 | * Similar to {@link MethodHandle#asType(MethodType)} except it also hooks in method handles produced by |
| aoqi@0 | 102 | * {@link GuardingTypeConverterFactory} implementations, providing for language-specific type coercing of |
| aoqi@0 | 103 | * parameters. It will apply {@link MethodHandle#asType(MethodType)} for all primitive-to-primitive, |
| aoqi@0 | 104 | * wrapper-to-primitive, primitive-to-wrapper conversions as well as for all upcasts. For all other conversions, |
| aoqi@0 | 105 | * it'll insert {@link MethodHandles#filterArguments(MethodHandle, int, MethodHandle...)} with composite filters |
| aoqi@0 | 106 | * provided by {@link GuardingTypeConverterFactory} implementations. It doesn't use language-specific conversions on |
| aoqi@0 | 107 | * the return type. |
| aoqi@0 | 108 | * |
| aoqi@0 | 109 | * @param handle target method handle |
| aoqi@0 | 110 | * @param fromType the types of source arguments |
| aoqi@0 | 111 | * @return a method handle that is a suitable combination of {@link MethodHandle#asType(MethodType)} and |
| aoqi@0 | 112 | * {@link MethodHandles#filterArguments(MethodHandle, int, MethodHandle...)} with |
| aoqi@0 | 113 | * {@link GuardingTypeConverterFactory} produced type converters as filters. |
| aoqi@0 | 114 | */ |
| aoqi@0 | 115 | public MethodHandle asType(MethodHandle handle, MethodType fromType); |
| aoqi@0 | 116 | |
| aoqi@0 | 117 | /** |
| aoqi@0 | 118 | * Given a source and target type, returns a method handle that converts between them. Never returns null; in worst |
| aoqi@0 | 119 | * case it will return an identity conversion (that might fail for some values at runtime). You rarely need to use |
| aoqi@0 | 120 | * this method directly; you should mostly rely on {@link #asType(MethodHandle, MethodType)} instead. You really |
| aoqi@0 | 121 | * only need this method if you have a piece of your program that is written in Java, and you need to reuse existing |
| aoqi@0 | 122 | * type conversion machinery in a non-invokedynamic context. |
| aoqi@0 | 123 | * @param sourceType the type to convert from |
| aoqi@0 | 124 | * @param targetType the type to convert to |
| aoqi@0 | 125 | * @return a method handle performing the conversion. |
| aoqi@0 | 126 | */ |
| aoqi@0 | 127 | public MethodHandle getTypeConverter(Class<?> sourceType, Class<?> targetType); |
| aoqi@0 | 128 | |
| aoqi@0 | 129 | /** |
| aoqi@0 | 130 | * Returns true if there might exist a conversion between the requested types (either an automatic JVM conversion, |
| aoqi@0 | 131 | * or one provided by any available {@link GuardingTypeConverterFactory}), or false if there definitely does not |
| aoqi@0 | 132 | * exist a conversion between the requested types. Note that returning true does not guarantee that the conversion |
| aoqi@0 | 133 | * will succeed at runtime (notably, if the "from" or "to" types are sufficiently generic), but returning false |
| aoqi@0 | 134 | * guarantees that it would fail. |
| aoqi@0 | 135 | * |
| aoqi@0 | 136 | * @param from the source type for the conversion |
| aoqi@0 | 137 | * @param to the target type for the conversion |
| aoqi@0 | 138 | * @return true if there can be a conversion, false if there can not. |
| aoqi@0 | 139 | */ |
| aoqi@0 | 140 | public boolean canConvert(Class<?> from, Class<?> to); |
| aoqi@0 | 141 | |
| aoqi@0 | 142 | /** |
| aoqi@0 | 143 | * Creates a guarded invocation using the {@link DynamicLinker} that exposes this linker services interface. Linkers |
| aoqi@0 | 144 | * can typically use them to delegate linking of wrapped objects. |
| aoqi@0 | 145 | * |
| aoqi@0 | 146 | * @param linkRequest a request for linking the invocation |
| aoqi@0 | 147 | * @return a guarded invocation linked by the top-level linker (or any of its delegates). Can be null if no |
| aoqi@0 | 148 | * available linker is able to link the invocation. |
| aoqi@0 | 149 | * @throws Exception in case the top-level linker throws an exception |
| aoqi@0 | 150 | */ |
| aoqi@0 | 151 | public GuardedInvocation getGuardedInvocation(LinkRequest linkRequest) throws Exception; |
| aoqi@0 | 152 | |
| aoqi@0 | 153 | /** |
| aoqi@0 | 154 | * Determines which of the two type conversions from a source type to the two target types is preferred. This is |
| aoqi@0 | 155 | * used for dynamic overloaded method resolution. If the source type is convertible to exactly one target type with |
| aoqi@0 | 156 | * a method invocation conversion, it is chosen, otherwise available {@link ConversionComparator}s are consulted. |
| aoqi@0 | 157 | * @param sourceType the source type. |
| aoqi@0 | 158 | * @param targetType1 one potential target type |
| aoqi@0 | 159 | * @param targetType2 another potential target type. |
| aoqi@0 | 160 | * @return one of Comparison constants that establish which - if any - of the target types is preferable for the |
| aoqi@0 | 161 | * conversion. |
| aoqi@0 | 162 | */ |
| aoqi@0 | 163 | public Comparison compareConversion(Class<?> sourceType, Class<?> targetType1, Class<?> targetType2); |
| aoqi@0 | 164 | } |
