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 * @build test.java.lang.invoke.lib.InstructionHelper
30 * @enablePreview
31 * @run testng CondyInterfaceWithOverpassMethods
32 * @run testng/othervm -XX:+UnlockDiagnosticVMOptions -XX:UseBootstrapCallInfo=3 CondyInterfaceWithOverpassMethods
33 */
34
35 import java.lang.classfile.ClassFile;
36 import org.testng.annotations.BeforeClass;
37 import org.testng.annotations.Test;
38 import test.java.lang.invoke.lib.InstructionHelper;
39
40 import java.lang.constant.*;
41 import java.lang.invoke.MethodHandles;
42 import java.lang.invoke.MethodType;
43
44 @Test
45 public class CondyInterfaceWithOverpassMethods {
46 interface A {
47 int a();
48
49 default int x() {
50 return 1;
51 }
52 }
53
54
55 // Generated class with methods containing condy ldc
56 Class<?> gc;
57
58 public static Object bsm(MethodHandles.Lookup l, String name, Class<?> type) {
59 return name;
60 }
61
62 @BeforeClass
63 public void generateClass() throws Exception {
64 // interface B extends A {
65 // // Overpass for method A.a
66 //
67 // default void y() {
68 // // ldc to Dynamic
69 // }
70 // }
71 Class<?> thisClass = CondyInterfaceWithOverpassMethods.class;
72
73 String genClassName = thisClass.getSimpleName() + "$Code";
74 String bsmClassName = thisClass.descriptorString();
75 String bsmMethodName = "bsm";
76 String bsmDescriptor = MethodType.methodType(Object.class, MethodHandles.Lookup.class,
77 String.class, Class.class).toMethodDescriptorString();
78
79 byte[] byteArray = ClassFile.of().build(ClassDesc.of(genClassName), classBuilder -> classBuilder
80 .withFlags(ClassFile.ACC_INTERFACE + ClassFile.ACC_ABSTRACT)
81 .withSuperclass(ConstantDescs.CD_Object)
82 .withInterfaceSymbols(InstructionHelper.classDesc(A.class))
83 .withMethod("y", MethodTypeDesc.of(ConstantDescs.CD_String), ClassFile.ACC_PUBLIC, methodBuilder -> methodBuilder
84 .withCode(codeBuilder -> codeBuilder
85 .ldc(DynamicConstantDesc.ofNamed(
86 MethodHandleDesc.of(
87 DirectMethodHandleDesc.Kind.STATIC,
88 ClassDesc.ofDescriptor(bsmClassName),
89 bsmMethodName,
90 bsmDescriptor
91 ),
92 "String",
93 ConstantDescs.CD_String
94 )
95 )
96 .areturn()
97 )
98 )
99 );
100 gc = MethodHandles.lookup().defineClass(byteArray);
101 }
102
103 @Test
104 public void testClass() throws Exception {
105 // Trigger initialization
106 Class.forName(gc.getName());
107 }
108 }