Mercurial > jdk8-mips64-public > nashorn / file comparison

comparison: src/jdk/internal/dynalink/DefaultBootstrapper.java

src/jdk/internal/dynalink/DefaultBootstrapper.java

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1 /*
2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 /*
27 * This file is available under and governed by the GNU General Public
28 * License version 2 only, as published by the Free Software Foundation.
29 * However, the following notice accompanied the original version of this
30 * file, and Oracle licenses the original version of this file under the BSD
31 * license:
32 */
33 /*
34 Copyright 2009-2013 Attila Szegedi
35
36 Licensed under both the Apache License, Version 2.0 (the "Apache License")
37 and the BSD License (the "BSD License"), with licensee being free to
38 choose either of the two at their discretion.
39
40 You may not use this file except in compliance with either the Apache
41 License or the BSD License.
42
43 If you choose to use this file in compliance with the Apache License, the
44 following notice applies to you:
45
46 You may obtain a copy of the Apache License at
47
48 http://www.apache.org/licenses/LICENSE-2.0
49
50 Unless required by applicable law or agreed to in writing, software
51 distributed under the License is distributed on an "AS IS" BASIS,
52 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
53 implied. See the License for the specific language governing
54 permissions and limitations under the License.
55
56 If you choose to use this file in compliance with the BSD License, the
57 following notice applies to you:
58
59 Redistribution and use in source and binary forms, with or without
60 modification, are permitted provided that the following conditions are
61 met:
62 * Redistributions of source code must retain the above copyright
63 notice, this list of conditions and the following disclaimer.
64 * Redistributions in binary form must reproduce the above copyright
65 notice, this list of conditions and the following disclaimer in the
66 documentation and/or other materials provided with the distribution.
67 * Neither the name of the copyright holder nor the names of
68 contributors may be used to endorse or promote products derived from
69 this software without specific prior written permission.
70
71 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
72 IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
73 TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
74 PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER
75 BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
76 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
77 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
78 BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
79 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
80 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
81 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
82 */
83
84 package jdk.internal.dynalink;
85
86 import java.lang.invoke.CallSite;
87 import java.lang.invoke.MethodHandles;
88 import java.lang.invoke.MethodType;
89 import jdk.internal.dynalink.support.CallSiteDescriptorFactory;
90
91
92 /**
93 * A convenience default bootstrapper that exposes static bootstrap methods which language runtimes that need the very
94 * default behavior can use with minimal setup. When first referenced, it will create a dynamic linker with default
95 * settings for the {@link DynamicLinkerFactory}, and its bootstrap methods will create {@link MonomorphicCallSite} for
96 * all call sites. It has two bootstrap methods: one creates call sites that use the
97 * {@link MethodHandles#publicLookup()} as the lookup for all call sites and disregard the one passed in as the caller,
98 * and one that just uses the passed caller as the lookup scope. Using the public lookup one is advised if your language
99 * runtime has no concept of interacting with Java visibility scopes, as it results in a more lightweight runtime
100 * information.
101 *
102 * @author Attila Szegedi
103 */
104 public class DefaultBootstrapper {
105 private static final DynamicLinker dynamicLinker = new DynamicLinkerFactory().createLinker();
106
107 private DefaultBootstrapper() {
108 }
109
110 /**
111 * Use this method as your bootstrap method (see the documentation of the java.lang.invoke package for how to do
112 * this). In case your language runtime doesn't have a concept of interaction with Java access scopes, you might
113 * want to consider using
114 * {@link #publicBootstrap(java.lang.invoke.MethodHandles.Lookup, String, MethodType)} instead.
115 *
116 * @param caller the caller's lookup
117 * @param name the name of the method at the call site
118 * @param type the method signature at the call site
119 * @return a new {@link MonomorphicCallSite} linked with the default dynamic linker.
120 */
121 public static CallSite bootstrap(MethodHandles.Lookup caller, String name, MethodType type) {
122 return bootstrapInternal(caller, name, type);
123 }
124
125 /**
126 * Use this method as your bootstrap method (see the documentation of the java.lang.invoke package for how to do
127 * this) when your language runtime doesn't have a concept of interaction with Java access scopes. If you need to
128 * preserve the different caller Lookup objects in the call sites, use
129 * {@link #bootstrap(java.lang.invoke.MethodHandles.Lookup, String, MethodType)} instead
130 *
131 * @param caller the caller's lookup. It is ignored as the call sites will be created with
132 * {@link MethodHandles#publicLookup()} instead.
133 * @param name the name of the method at the call site
134 * @param type the method signature at the call site
135 * @return a new {@link MonomorphicCallSite} linked with the default dynamic linker.
136 */
137 public static CallSite publicBootstrap(@SuppressWarnings("unused") MethodHandles.Lookup caller, String name, MethodType type) {
138 return bootstrapInternal(MethodHandles.publicLookup(), name, type);
139 }
140
141 private static CallSite bootstrapInternal(MethodHandles.Lookup caller, String name, MethodType type) {
142 return dynamicLinker.link(new MonomorphicCallSite(CallSiteDescriptorFactory.create(caller, name, type)));
143 }
144 }

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