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
84package jdk.dynalink.beans;
85
86import java.lang.invoke.MethodHandle;
87import java.lang.invoke.MethodHandles;
88import java.lang.invoke.MethodType;
89import java.lang.reflect.AccessibleObject;
90import java.lang.reflect.Constructor;
91import java.lang.reflect.Executable;
92import java.lang.reflect.Member;
93import java.lang.reflect.Method;
94import java.lang.reflect.Modifier;
95import java.security.AccessControlContext;
96import java.security.AccessController;
97import java.security.PrivilegedAction;
98import jdk.dynalink.CallSiteDescriptor;
99import jdk.dynalink.SecureLookupSupplier;
100import jdk.dynalink.internal.AccessControlContextFactory;
101import jdk.dynalink.linker.support.Lookup;
102import jdk.internal.reflect.CallerSensitive;
103
104
105/**
106 * A dynamic method bound to exactly one Java method or constructor that is caller sensitive. Since the target method is
107 * caller sensitive, it doesn't cache a method handle but rather uses the passed lookup object in
108 * {@link #getTarget(CallSiteDescriptor)} to unreflect a method handle from the reflective member on
109 * every request.
110 */
111class CallerSensitiveDynamicMethod extends SingleDynamicMethod {
112    private static final AccessControlContext GET_LOOKUP_CONTEXT =
113            AccessControlContextFactory.createAccessControlContext(
114                    SecureLookupSupplier.GET_LOOKUP_PERMISSION_NAME);
115
116    // Typed as "AccessibleObject" as it can be either a method or a constructor.
117    // If we were Java8-only, we could use java.lang.reflect.Executable
118    private final AccessibleObject target;
119    private final MethodType type;
120
121    CallerSensitiveDynamicMethod(final AccessibleObject target) {
122        super(getName(target));
123        this.target = target;
124        this.type = getMethodType(target);
125    }
126
127    private static String getName(final AccessibleObject target) {
128        final Member m = (Member)target;
129        final boolean constructor = m instanceof Constructor;
130        return getMethodNameWithSignature(getMethodType(target), constructor ? m.getName() :
131            getClassAndMethodName(m.getDeclaringClass(), m.getName()), !constructor);
132    }
133
134    @Override
135    MethodType getMethodType() {
136        return type;
137    }
138
139    private static MethodType getMethodType(final AccessibleObject ao) {
140        final boolean isMethod = ao instanceof Method;
141        final Class<?> rtype = isMethod ? ((Method)ao).getReturnType() : ((Constructor<?>)ao).getDeclaringClass();
142        final Class<?>[] ptypes = isMethod ? ((Method)ao).getParameterTypes() : ((Constructor<?>)ao).getParameterTypes();
143        final MethodType type = MethodType.methodType(rtype, ptypes);
144        final Member m = (Member)ao;
145        return type.insertParameterTypes(0,
146                isMethod ?
147                        Modifier.isStatic(m.getModifiers()) ?
148                                Object.class :
149                                m.getDeclaringClass() :
150                        StaticClass.class);
151    }
152
153    @Override
154    boolean isVarArgs() {
155        return target instanceof Method ? ((Method)target).isVarArgs() : ((Constructor<?>)target).isVarArgs();
156    }
157
158    @Override
159    MethodHandle getTarget(final CallSiteDescriptor desc) {
160        final MethodHandles.Lookup lookup = AccessController.doPrivileged(
161                (PrivilegedAction<MethodHandles.Lookup>)()->desc.getLookup(),
162                GET_LOOKUP_CONTEXT);
163
164        if(target instanceof Method) {
165            final MethodHandle mh = unreflect(lookup, (Method)target);
166            if(Modifier.isStatic(((Member)target).getModifiers())) {
167                return StaticClassIntrospector.editStaticMethodHandle(mh);
168            }
169            return mh;
170        }
171        return StaticClassIntrospector.editConstructorMethodHandle(unreflectConstructor(lookup,
172                (Constructor<?>)target));
173    }
174
175    @Override
176    boolean isConstructor() {
177        return target instanceof Constructor;
178    }
179
180    private static MethodHandle unreflect(final MethodHandles.Lookup lookup, final Method m) {
181        return Lookup.unreflect(lookup, m);
182    }
183
184    private static MethodHandle unreflectConstructor(final MethodHandles.Lookup lookup, final Constructor<?> c) {
185        return Lookup.unreflectConstructor(lookup, c);
186    }
187}
188