1 /*
2 * Copyright (c) 2014, 2023, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /* @test
25 * @bug 8032400
26 * @summary JSR292: invokeSpecial: InternalError attempting to lookup a method
27 * @enablePreview
28 * @compile -XDignore.symbol.file SpecialStatic.java
29 * @run testng test.java.lang.invoke.lookup.SpecialStatic
30 */
31 package test.java.lang.invoke.lookup;
32
33 import java.lang.classfile.ClassFile;
34 import java.lang.constant.ClassDesc;
35 import java.lang.constant.MethodHandleDesc;
36 import java.lang.constant.MethodTypeDesc;
37 import java.lang.invoke.MethodHandle;
38 import java.lang.invoke.MethodHandles;
39 import java.lang.invoke.MethodType;
40 import java.lang.reflect.AccessFlag;
41
42 import org.testng.annotations.*;
43
44 import static java.lang.classfile.ClassFile.ACC_PUBLIC;
45 import static java.lang.classfile.ClassFile.ACC_STATIC;
46 import static java.lang.constant.ConstantDescs.*;
47 import static java.lang.constant.DirectMethodHandleDesc.Kind.SPECIAL;
48 import static org.testng.Assert.*;
49
50 /**
51 * Test case:
52 * class T1 { int m() { return 1; }}
53 * class T2 extends T1 { static int m() { return 2; }}
54 * class T3 extends T2 { int m() { return 3; }}
55 *
56 * T3::test { invokespecial T1.m() T3 } ==> T1::m
57 */
58 public class SpecialStatic {
59 static class CustomClassLoader extends ClassLoader {
60 public Class<?> loadClass(String name) throws ClassNotFoundException {
61 if (findLoadedClass(name) != null) {
62 return findLoadedClass(name);
63 }
64
65 if ("T1".equals(name)) {
66 byte[] classFile = dumpT1();
67 return defineClass("T1", classFile, 0, classFile.length);
68 }
69 if ("T2".equals(name)) {
70 byte[] classFile = dumpT2();
71 return defineClass("T2", classFile, 0, classFile.length);
72 }
73 if ("T3".equals(name)) {
74 byte[] classFile = dumpT3();
75 return defineClass("T3", classFile, 0, classFile.length);
76 }
77
78 return super.loadClass(name);
79 }
80 }
81
82 private static ClassLoader cl = new CustomClassLoader();
83 private static Class t1, t3;
84 private static final MethodTypeDesc MTD_int = MethodTypeDesc.of(CD_int);
85 private static final MethodTypeDesc MTD_Lookup = MethodTypeDesc.of(CD_MethodHandles_Lookup);
86 private static final String METHOD_NAME = "m";
87 private static final ClassDesc CD_T1 = ClassDesc.of("T1");
88 private static final ClassDesc CD_T2 = ClassDesc.of("T2");
89 private static final ClassDesc CD_T3 = ClassDesc.of("T3");
90 static {
91 try {
92 t1 = cl.loadClass("T1");
93 t3 = cl.loadClass("T3");
94 } catch (ClassNotFoundException e) {
95 throw new Error(e);
96 }
97 }
98
99 public static void main(String[] args) throws Throwable {
100 SpecialStatic test = new SpecialStatic();
101 test.testConstant();
102 test.testFindSpecial();
103 }
104
105 @Test
106 public void testConstant() throws Throwable {
107 MethodHandle mh = (MethodHandle)t3.getDeclaredMethod("getMethodHandle").invoke(null);
108 int result = (int)mh.invoke(t3.newInstance());
109 assertEquals(result, 1); // T1.m should be invoked.
110 }
111
112 @Test
113 public void testFindSpecial() throws Throwable {
114 MethodHandles.Lookup lookup = (MethodHandles.Lookup)t3.getDeclaredMethod("getLookup").invoke(null);
115 MethodHandle mh = lookup.findSpecial(t1, "m", MethodType.methodType(int.class), t3);
116 int result = (int)mh.invoke(t3.newInstance());
117 assertEquals(result, 1); // T1.m should be invoked.
118 }
119
120 public static byte[] dumpT1() {
121 return ClassFile.of().build(CD_T1, clb -> {
122 clb.withSuperclass(CD_Object);
123 clb.withFlags(AccessFlag.PUBLIC, AccessFlag.IDENTITY);
124 clb.withMethodBody(INIT_NAME, MTD_void, ACC_PUBLIC, cob -> {
125 cob.aload(0);
126 cob.invokespecial(CD_Object, INIT_NAME, MTD_void);
127 cob.return_();
128 });
129 clb.withMethodBody(METHOD_NAME, MTD_int, ACC_PUBLIC, cob -> {
130 cob.bipush(1);
131 cob.ireturn();
132 });
133 });
134 }
135
136 public static byte[] dumpT2() {
137 return ClassFile.of().build(CD_T2, clb -> {
138 clb.withSuperclass(CD_T1);
139 clb.withFlags(AccessFlag.PUBLIC, AccessFlag.IDENTITY);
140 clb.withMethodBody(INIT_NAME, MTD_void, ACC_PUBLIC, cob -> {
141 cob.aload(0);
142 cob.invokespecial(CD_T1, INIT_NAME, MTD_void);
143 cob.return_();
144 });
145 clb.withMethodBody(METHOD_NAME, MTD_int, ACC_PUBLIC | ACC_STATIC, cob -> {
146 cob.bipush(2);
147 cob.ireturn();
148 });
149 });
150 }
151
152 public static byte[] dumpT3() {
153 return ClassFile.of().build(CD_T3, clb -> {
154 clb.withSuperclass(CD_T2);
155 clb.withFlags(AccessFlag.PUBLIC, AccessFlag.IDENTITY);
156 clb.withMethodBody(INIT_NAME, MTD_void, ACC_PUBLIC, cob -> {
157 cob.aload(0);
158 cob.invokespecial(CD_T2, INIT_NAME, MTD_void);
159 cob.return_();
160 });
161 clb.withMethodBody(METHOD_NAME, MTD_int, ACC_PUBLIC, cob -> {
162 cob.bipush(3);
163 cob.ireturn();
164 });
165 clb.withMethodBody("getMethodHandle", MethodTypeDesc.of(CD_MethodHandle),
166 ACC_PUBLIC | ACC_STATIC, cob -> {
167 cob.constantInstruction(MethodHandleDesc.ofMethod(SPECIAL, CD_T1, METHOD_NAME, MTD_int));
168 cob.areturn();
169 });
170 clb.withMethodBody("getLookup", MTD_Lookup,
171 ACC_PUBLIC | ACC_STATIC, cob -> {
172 cob.invokestatic(CD_MethodHandles, "lookup", MTD_Lookup);
173 cob.areturn();
174 });
175 });
176 }
177 }