1 /*
2 * Copyright (c) 2018, 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 /*
25 * @test
26 * @bug 8186046
27 * @summary Test for an interface using condy with default overpass methods
28 * @library /java/lang/invoke/common
29 * @enablePreview
30 * @run testng CondyInterfaceWithOverpassMethods
31 * @run testng/othervm -XX:+UnlockDiagnosticVMOptions -XX:UseBootstrapCallInfo=3 CondyInterfaceWithOverpassMethods
32 */
33
34 import java.lang.classfile.ClassFile;
35 import org.testng.annotations.BeforeClass;
36 import org.testng.annotations.Test;
37 import test.java.lang.invoke.lib.InstructionHelper;
38
39 import java.lang.constant.*;
40 import java.lang.invoke.MethodHandles;
41 import java.lang.invoke.MethodType;
42
43 @Test
44 public class CondyInterfaceWithOverpassMethods {
45 interface A {
46 int a();
47
48 default int x() {
49 return 1;
50 }
51 }
52
53
54 // Generated class with methods containing condy ldc
55 Class<?> gc;
56
57 public static Object bsm(MethodHandles.Lookup l, String name, Class<?> type) {
58 return name;
59 }
60
61 @BeforeClass
62 public void generateClass() throws Exception {
63 // interface B extends A {
64 // // Overpass for method A.a
65 //
66 // default void y() {
67 // // ldc to Dynamic
68 // }
69 // }
70 Class<?> thisClass = CondyInterfaceWithOverpassMethods.class;
71
72 String genClassName = thisClass.getSimpleName() + "$Code";
73 String bsmClassName = thisClass.descriptorString();
74 String bsmMethodName = "bsm";
75 String bsmDescriptor = MethodType.methodType(Object.class, MethodHandles.Lookup.class,
76 String.class, Class.class).toMethodDescriptorString();
77
78 byte[] byteArray = ClassFile.of().build(ClassDesc.of(genClassName), classBuilder -> classBuilder
79 .withFlags(ClassFile.ACC_INTERFACE + ClassFile.ACC_ABSTRACT)
80 .withSuperclass(ConstantDescs.CD_Object)
81 .withInterfaceSymbols(InstructionHelper.classDesc(A.class))
82 .withMethod("y", MethodTypeDesc.of(ConstantDescs.CD_String), ClassFile.ACC_PUBLIC, methodBuilder -> methodBuilder
83 .withCode(codeBuilder -> codeBuilder
84 .ldc(DynamicConstantDesc.ofNamed(
85 MethodHandleDesc.of(
86 DirectMethodHandleDesc.Kind.STATIC,
87 ClassDesc.ofDescriptor(bsmClassName),
88 bsmMethodName,
89 bsmDescriptor
90 ),
91 "String",
92 ConstantDescs.CD_String
93 )
94 )
95 .areturn()
96 )
97 )
98 );
99 gc = MethodHandles.lookup().defineClass(byteArray);
100 }
101
102 @Test
103 public void testClass() throws Exception {
104 // Trigger initialization
105 Class.forName(gc.getName());
106 }
107 }