1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/*
* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package java.lang.invoke;
import java.security.*;
import java.lang.reflect.*;
import java.lang.invoke.MethodHandleNatives.Constants;
import java.lang.invoke.MethodHandles.Lookup;
import static java.lang.invoke.MethodHandleStatics.*;
/*
* Auxiliary to MethodHandleInfo, wants to nest in MethodHandleInfo but must be non-public.
*/
/*non-public*/
final
class InfoFromMemberName implements MethodHandleInfo {
private final MemberName member;
private final int referenceKind;
InfoFromMemberName(Lookup lookup, MemberName member, byte referenceKind) {
assert(member.isResolved() || member.isMethodHandleInvoke() || member.isVarHandleMethodInvoke());
assert(member.referenceKindIsConsistentWith(referenceKind));
this.member = member;
this.referenceKind = referenceKind;
}
@Override
public Class<?> getDeclaringClass() {
return member.getDeclaringClass();
}
@Override
public String getName() {
return member.getName();
}
@Override
public MethodType getMethodType() {
return member.getMethodOrFieldType();
}
@Override
public int getModifiers() {
return member.getModifiers();
}
@Override
public int getReferenceKind() {
return referenceKind;
}
@Override
public String toString() {
return MethodHandleInfo.toString(getReferenceKind(), getDeclaringClass(), getName(), getMethodType());
}
@Override
public <T extends Member> T reflectAs(Class<T> expected, Lookup lookup) {
if ((member.isMethodHandleInvoke() || member.isVarHandleMethodInvoke())
&& !member.isVarargs()) {
// This member is an instance of a signature-polymorphic method, which cannot be reflected
// A method handle invoker can come in either of two forms:
// A generic placeholder (present in the source code, and varargs)
// and a signature-polymorphic instance (synthetic and not varargs).
// For more information see comments on {@link MethodHandleNatives#linkMethod}.
throw new IllegalArgumentException("cannot reflect signature polymorphic method");
}
Member mem = AccessController.doPrivileged(new PrivilegedAction<>() {
public Member run() {
try {
return reflectUnchecked();
} catch (ReflectiveOperationException ex) {
throw new IllegalArgumentException(ex);
}
}
});
try {
Class<?> defc = getDeclaringClass();
byte refKind = (byte) getReferenceKind();
lookup.checkAccess(refKind, defc, convertToMemberName(refKind, mem));
} catch (IllegalAccessException ex) {
throw new IllegalArgumentException(ex);
}
return expected.cast(mem);
}
private Member reflectUnchecked() throws ReflectiveOperationException {
byte refKind = (byte) getReferenceKind();
Class<?> defc = getDeclaringClass();
boolean isPublic = Modifier.isPublic(getModifiers());
if (MethodHandleNatives.refKindIsMethod(refKind)) {
if (isPublic)
return defc.getMethod(getName(), getMethodType().parameterArray());
else
return defc.getDeclaredMethod(getName(), getMethodType().parameterArray());
} else if (MethodHandleNatives.refKindIsConstructor(refKind)) {
if (isPublic)
return defc.getConstructor(getMethodType().parameterArray());
else
return defc.getDeclaredConstructor(getMethodType().parameterArray());
} else if (MethodHandleNatives.refKindIsField(refKind)) {
if (isPublic)
return defc.getField(getName());
else
return defc.getDeclaredField(getName());
} else {
throw new IllegalArgumentException("referenceKind="+refKind);
}
}
private static MemberName convertToMemberName(byte refKind, Member mem) throws IllegalAccessException {
if (mem instanceof Method) {
boolean wantSpecial = (refKind == REF_invokeSpecial);
return new MemberName((Method) mem, wantSpecial);
} else if (mem instanceof Constructor) {
return new MemberName((Constructor) mem);
} else if (mem instanceof Field) {
boolean isSetter = (refKind == REF_putField || refKind == REF_putStatic);
return new MemberName((Field) mem, isSetter);
}
throw new InternalError(mem.getClass().getName());
}
}
|
