1 /*
2 * Copyright (c) 2024, 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 package java.lang.reflect.code.type.impl;
27
28 import java.lang.reflect.code.op.CoreOp;
29 import java.lang.reflect.code.type.MethodRef;
30 import java.lang.invoke.MethodHandle;
31 import java.lang.invoke.MethodHandleInfo;
32 import java.lang.invoke.MethodHandles;
33 import java.lang.invoke.MethodType;
34 import java.lang.reflect.Method;
35 import java.lang.reflect.code.type.FunctionType;
36 import java.lang.reflect.code.type.JavaType;
37 import java.lang.reflect.code.TypeElement;
38 import java.util.Optional;
39
40 import static java.util.stream.Collectors.joining;
41
42 public final class MethodRefImpl implements MethodRef {
43 final TypeElement refType;
44 final String name;
45 final FunctionType type;
46
47 public MethodRefImpl(TypeElement refType, String name, FunctionType type) {
48 this.refType = refType;
49 this.name = name;
50 this.type = type;
51 }
52
53 @Override
54 public TypeElement refType() {
55 return refType;
56 }
57
58 @Override
59 public String name() {
60 return name;
61 }
62
63 @Override
64 public FunctionType type() {
65 return type;
66 }
67
68 @Override
69 public Method resolveToMember(MethodHandles.Lookup l) throws ReflectiveOperationException {
70 // @@@ Constructor
71 MethodHandleInfo methodHandleInfo = l.revealDirect(resolveToHandle(l));
72 return methodHandleInfo.reflectAs(Method.class, l);
73 }
74
75 @Override
76 public MethodHandle resolveToHandle(MethodHandles.Lookup l) throws ReflectiveOperationException {
77 // @@@ kind
78 Class<?> refC = resolve(l, refType);
79
80 MethodType mt = MethodRef.toNominalDescriptor(type).resolveConstantDesc(l);
81
82 MethodHandle mh = null;
83 ReflectiveOperationException c = null;
84
85 try {
86 mh = l.findStatic(refC, name, mt);
87 } catch (NoSuchMethodException | IllegalAccessException e) {
88 c = e;
89 }
90
91 if (c != null) {
92 c = null;
93 try {
94 mh = l.findVirtual(refC, name, mt);
95 } catch (NoSuchMethodException | IllegalAccessException e) {
96 c = e;
97 }
98 }
99
100 if (c != null) {
101 throw c;
102 }
103
104 assert mh != null;
105 return mh;
106 }
107
108 static Class<?> resolve(MethodHandles.Lookup l, TypeElement t) throws ReflectiveOperationException {
109 if (t instanceof JavaType jt) {
110 return (Class<?>)jt.erasure().resolve(l);
111 } else {
112 // @@@
113 throw new ReflectiveOperationException();
114 }
115 }
116
117 // Copied code in jdk.compiler module throws UOE
118 @Override
119 public Optional<CoreOp.FuncOp> codeModel(MethodHandles.Lookup l) throws ReflectiveOperationException {
120 /*__throw new UnsupportedOperationException();__*/ return resolveToMember(l).getCodeModel();
121 }
122
123 @Override
124 public String toString() {
125 return refType + "::" + name +
126 type.parameterTypes().stream().map(TypeElement::toString)
127 .collect(joining(", ", "(", ")")) + type.returnType();
128 }
129
130 @Override
131 public boolean equals(Object o) {
132 if (this == o) return true;
133 if (o == null || getClass() != o.getClass()) return false;
134
135 MethodRefImpl that = (MethodRefImpl) o;
136
137 if (!refType.equals(that.refType)) return false;
138 if (!name.equals(that.name)) return false;
139 return type.equals(that.type);
140 }
141
142 @Override
143 public int hashCode() {
144 int result = refType.hashCode();
145 result = 31 * result + name.hashCode();
146 result = 31 * result + type.hashCode();
147 return result;
148 }
149 }