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

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

src/jdk/internal/dynalink/RelinkableCallSite.java

changeset 90
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89:43e32b36153c 90:5a820fb11814
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.MethodHandle;
88 import java.lang.invoke.MutableCallSite;
89 import java.lang.invoke.VolatileCallSite;
90 import jdk.internal.dynalink.linker.GuardedInvocation;
91
92
93 /**
94 * Interface for relinkable call sites. Language runtimes wishing to use this framework must use subclasses of
95 * {@link CallSite} that also implement this interface as their call sites. There is a readily usable
96 * {@link MonomorphicCallSite} subclass that implements monomorphic inline caching strategy as well as a
97 * {@link ChainedCallSite} that retains a chain of already linked method handles. The reason this is defined as an
98 * interface instead of a concrete, albeit abstract class is that it allows independent implementations to choose
99 * between {@link MutableCallSite} and {@link VolatileCallSite} as they see fit.
100 *
101 * @author Attila Szegedi
102 */
103 public interface RelinkableCallSite {
104 /**
105 * Initializes the relinkable call site by setting a relink-and-invoke method handle. The call site implementation
106 * is supposed to set this method handle as its target.
107 * @param relinkAndInvoke a relink-and-invoke method handle supplied by the {@link DynamicLinker}.
108 */
109 public void initialize(MethodHandle relinkAndInvoke);
110
111 /**
112 * Returns the descriptor for this call site.
113 *
114 * @return the descriptor for this call site.
115 */
116 public CallSiteDescriptor getDescriptor();
117
118 /**
119 * This method will be called by the dynamic linker every time the call site is normally relinked. It will be passed
120 * a {@code GuardedInvocation} that the call site should incorporate into its target method handle. When this method
121 * is called, the call site is allowed to keep other non-invalidated invocations around for implementation of
122 * polymorphic inline caches and compose them with this invocation to form its final target.
123 *
124 * @param guardedInvocation the guarded invocation that the call site should incorporate into its target method
125 * handle.
126 * @param fallback the fallback method. This is a method matching the method type of the call site that is supplied
127 * by the {@link DynamicLinker} to be used by this call site as a fallback when it can't invoke its target with the
128 * passed arguments. The fallback method is such that when it's invoked, it'll try to discover the adequate target
129 * for the invocation, subsequently invoke {@link #relink(GuardedInvocation, MethodHandle)} or
130 * {@link #resetAndRelink(GuardedInvocation, MethodHandle)}, and finally invoke the target.
131 */
132 public void relink(GuardedInvocation guardedInvocation, MethodHandle fallback);
133
134 /**
135 * This method will be called by the dynamic linker every time the call site is relinked and the linker wishes the
136 * call site to throw away any prior linkage state. It will be passed a {@code GuardedInvocation} that the call site
137 * should use to build its target method handle. When this method is called, the call site is discouraged from
138 * keeping previous state around, and is supposed to only link the current invocation.
139 *
140 * @param guardedInvocation the guarded invocation that the call site should use to build its target method handle.
141 * @param fallback the fallback method. This is a method matching the method type of the call site that is supplied
142 * by the {@link DynamicLinker} to be used by this call site as a fallback when it can't invoke its target with the
143 * passed arguments. The fallback method is such that when it's invoked, it'll try to discover the adequate target
144 * for the invocation, subsequently invoke {@link #relink(GuardedInvocation, MethodHandle)} or
145 * {@link #resetAndRelink(GuardedInvocation, MethodHandle)}, and finally invoke the target.
146 */
147 public void resetAndRelink(GuardedInvocation guardedInvocation, MethodHandle fallback);
148 }

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