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 jdk.incubator.code.dialect.java.impl;
27
28 import jdk.incubator.code.dialect.java.FieldRef;
29 import java.lang.invoke.MethodHandles;
30 import java.lang.invoke.VarHandle;
31 import java.lang.reflect.Field;
32
33 import jdk.incubator.code.dialect.java.JavaType;
34 import jdk.incubator.code.TypeElement;
35 import jdk.incubator.code.extern.ExternalizedTypeElement;
36
37 public final class FieldRefImpl implements FieldRef {
38
39 final TypeElement refType;
40 final String name;
41 final TypeElement type;
42
43 public FieldRefImpl(TypeElement refType, String name, TypeElement type) {
44 this.refType = refType;
45 this.name = name;
46 this.type = type;
47 }
48
49 @Override
50 public TypeElement refType() {
51 return refType;
52 }
53
54 @Override
55 public String name() {
56 return name;
57 }
58
59 @Override
60 public TypeElement type() {
61 return type;
62 }
63
64 @Override
65 public Field resolveToMember(MethodHandles.Lookup l) throws ReflectiveOperationException {
66 Class<?> refC = resolve(l, refType);
67 Class<?> typeC = resolve(l, type);
68
69 Field f = refC.getDeclaredField(name);
70 if (!f.getType().equals(typeC)) {
71 throw new NoSuchFieldException();
72 }
73
74 return f;
75 }
76
77 @Override
78 public VarHandle resolveToHandle(MethodHandles.Lookup l) throws ReflectiveOperationException {
79 Class<?> refC = resolve(l, refType);
80 Class<?> typeC = resolve(l, type);
81
82 VarHandle vh = null;
83 ReflectiveOperationException c = null;
84
85 try {
86 vh = l.findStaticVarHandle(refC, name, typeC);
87 } catch (NoSuchFieldException | IllegalAccessException e) {
88 c = e;
89 }
90
91 if (c != null) {
92 c = null;
93 try {
94 vh = l.findVarHandle(refC, name, typeC);
95 } catch (NoSuchFieldException | IllegalAccessException e) {
96 c = e;
97 }
98 }
99
100 if (c != null) {
101 throw c;
102 }
103
104 assert vh != null;
105 return vh;
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 @Override
118 public ExternalizedTypeElement externalize() {
119 return JavaTypeUtils.fieldRef(name, refType.externalize(), type.externalize());
120 }
121
122 @Override
123 public String toString() {
124 return JavaTypeUtils.toExternalRefString(externalize());
125 }
126
127 @Override
128 public boolean equals(Object o) {
129 if (this == o) return true;
130 if (o == null || getClass() != o.getClass()) return false;
131
132 FieldRefImpl fieldDesc = (FieldRefImpl) o;
133
134 if (!refType.equals(fieldDesc.refType)) return false;
135 if (!name.equals(fieldDesc.name)) return false;
136 return type.equals(fieldDesc.type);
137 }
138
139 @Override
140 public int hashCode() {
141 int result = refType.hashCode();
142 result = 31 * result + name.hashCode();
143 result = 31 * result + type.hashCode();
144 return result;
145 }
146 }