1 /*
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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
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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).
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17  * You should have received a copy of the GNU General Public License version
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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.support;
85 
86 import jdk.internal.dynalink.CallSiteDescriptor;
87 import jdk.internal.dynalink.linker.LinkRequest;
88 
89 /**
90  * A link request implementation for call sites that pass language runtime specific context arguments on the stack. The
91  * context specific arguments should be the first "n" arguments.
92  *
93  * @author Attila Szegedi
94  */
95 public class RuntimeContextLinkRequestImpl extends LinkRequestImpl {
96 
97     private final int runtimeContextArgCount;
98     private LinkRequestImpl contextStrippedRequest;
99 
100     /**
101      * Creates a new link request.
102      *
103      * @param callSiteDescriptor the descriptor for the call site being linked
104      * @param callSiteToken the opaque token for the call site being linked.
105      * @param arguments the arguments for the invocation
106      * @param linkCount number of times callsite has been linked/relinked
107      * @param callSiteUnstable true if the call site being linked is considered unstable
108      * @param runtimeContextArgCount the number of the leading arguments on the stack that represent the language
109      * runtime specific context arguments.
110      * @throws IllegalArgumentException if runtimeContextArgCount is less than 1.
111      */
RuntimeContextLinkRequestImpl(final CallSiteDescriptor callSiteDescriptor, final Object callSiteToken, final int linkCount, final boolean callSiteUnstable, final Object[] arguments, final int runtimeContextArgCount)112     public RuntimeContextLinkRequestImpl(final CallSiteDescriptor callSiteDescriptor, final Object callSiteToken,
113             final int linkCount, final boolean callSiteUnstable, final Object[] arguments, final int runtimeContextArgCount) {
114         super(callSiteDescriptor, callSiteToken, linkCount, callSiteUnstable, arguments);
115         if(runtimeContextArgCount < 1) {
116             throw new IllegalArgumentException("runtimeContextArgCount < 1");
117         }
118         this.runtimeContextArgCount = runtimeContextArgCount;
119     }
120 
121     @Override
withoutRuntimeContext()122     public LinkRequest withoutRuntimeContext() {
123         if(contextStrippedRequest == null) {
124             contextStrippedRequest =
125                     new LinkRequestImpl(CallSiteDescriptorFactory.dropParameterTypes(getCallSiteDescriptor(), 1,
126                             runtimeContextArgCount + 1), getCallSiteToken(), getLinkCount(), isCallSiteUnstable(), getTruncatedArguments());
127         }
128         return contextStrippedRequest;
129     }
130 
131     @Override
replaceArguments(final CallSiteDescriptor callSiteDescriptor, final Object[] arguments)132     public LinkRequest replaceArguments(final CallSiteDescriptor callSiteDescriptor, final Object[] arguments) {
133         return new RuntimeContextLinkRequestImpl(callSiteDescriptor, getCallSiteToken(), getLinkCount(), isCallSiteUnstable(), arguments,
134                 runtimeContextArgCount);
135     }
136 
getTruncatedArguments()137     private Object[] getTruncatedArguments() {
138         final Object[] args = getArguments();
139         final Object[] newargs = new Object[args.length - runtimeContextArgCount];
140         newargs[0] = args[0]; // "this" remains at the 0th position
141         System.arraycopy(args, runtimeContextArgCount + 1, newargs, 1, newargs.length - 1);
142         return newargs;
143     }
144 }
145