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/*
* Copyright (c) 2013, 2023, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 8026213
* @summary Reflection support for private methods in interfaces
* @author Robert Field
* @run main TestPrivateInterfaceMethodReflect
*/
import java.lang.classfile.ClassFile;
import java.lang.constant.ClassDesc;
import java.lang.constant.MethodTypeDesc;
import java.lang.reflect.*;
import static java.lang.classfile.ClassFile.ACC_PRIVATE;
import static java.lang.classfile.ClassFile.ACC_PUBLIC;
import static java.lang.constant.ConstantDescs.CD_Object;
import static java.lang.constant.ConstantDescs.CD_int;
import static java.lang.constant.ConstantDescs.INIT_NAME;
import static java.lang.constant.ConstantDescs.MTD_void;
public class TestPrivateInterfaceMethodReflect {
static final String INTERFACE_NAME = "PrivateInterfaceMethodReflectTest_Interface";
static final String CLASS_NAME = "PrivateInterfaceMethodReflectTest_Class";
static final int EXPECTED = 1234;
static class TestClassLoader extends ClassLoader {
@Override
public Class<?> findClass(String name) throws ClassNotFoundException {
byte[] b;
try {
b = loadClassData(name);
} catch (Throwable th) {
// th.printStackTrace();
throw new ClassNotFoundException("Loading error", th);
}
return defineClass(name, b, 0, b.length);
}
private byte[] loadClassData(String name) {
return switch (name) {
case INTERFACE_NAME -> ClassFile.of().build(ClassDesc.ofInternalName(INTERFACE_NAME), clb -> {
clb.withFlags(AccessFlag.ABSTRACT, AccessFlag.INTERFACE, AccessFlag.PUBLIC);
clb.withSuperclass(CD_Object);
clb.withMethodBody("privInstance", MethodTypeDesc.of(CD_int), ACC_PRIVATE, cob -> {
cob.loadConstant(EXPECTED);
cob.ireturn();
});
});
case CLASS_NAME -> ClassFile.of().build(ClassDesc.of(CLASS_NAME), clb -> {
clb.withFlags(AccessFlag.PUBLIC);
clb.withSuperclass(CD_Object);
clb.withInterfaceSymbols(ClassDesc.ofInternalName(INTERFACE_NAME));
clb.withMethodBody(INIT_NAME, MTD_void, ACC_PUBLIC, cob -> {
cob.aload(0);
cob.invokespecial(CD_Object, INIT_NAME, MTD_void);
cob.return_();
});
});
default -> throw new IllegalArgumentException();
};
}
}
public static void main(String[] args) throws Exception {
TestClassLoader tcl = new TestClassLoader();
Class<?> itf = tcl.loadClass(INTERFACE_NAME);
Class<?> k = tcl.loadClass(CLASS_NAME);
Object inst = k.getDeclaredConstructor().newInstance();
Method[] meths = itf.getDeclaredMethods();
if (meths.length != 1) {
throw new Exception("Expected one method in " + INTERFACE_NAME + " instead " + meths.length);
}
Method m = meths[0];
int mod = m.getModifiers();
if ((mod & Modifier.PRIVATE) == 0) {
throw new Exception("Expected " + m + " to be private");
}
if ((mod & Modifier.STATIC) != 0) {
throw new Exception("Expected " + m + " to be instance method");
}
m.setAccessible(true);
for (int i = 1; i < 200; i++) {
if (!m.invoke(inst).equals(EXPECTED)) {
throw new Exception("Expected " + EXPECTED + " from " + m);
}
}
System.out.println("Passed.");
}
}
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