ae82405ff7
Reviewed-by: briangoetz, psandoz
119 lines
4.7 KiB
Java
119 lines
4.7 KiB
Java
/*
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* Copyright (c) 2013, 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8026213
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* @summary Reflection support for private methods in interfaces
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* @author Robert Field
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* @enablePreview
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* @run main TestPrivateInterfaceMethodReflect
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*/
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import java.lang.classfile.ClassFile;
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import java.lang.constant.ClassDesc;
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import java.lang.constant.MethodTypeDesc;
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import java.lang.reflect.*;
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import static java.lang.classfile.ClassFile.ACC_PRIVATE;
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import static java.lang.classfile.ClassFile.ACC_PUBLIC;
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import static java.lang.constant.ConstantDescs.CD_Object;
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import static java.lang.constant.ConstantDescs.CD_int;
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import static java.lang.constant.ConstantDescs.INIT_NAME;
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import static java.lang.constant.ConstantDescs.MTD_void;
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public class TestPrivateInterfaceMethodReflect {
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static final String INTERFACE_NAME = "PrivateInterfaceMethodReflectTest_Interface";
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static final String CLASS_NAME = "PrivateInterfaceMethodReflectTest_Class";
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static final int EXPECTED = 1234;
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static class TestClassLoader extends ClassLoader {
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@Override
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public Class<?> findClass(String name) throws ClassNotFoundException {
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byte[] b;
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try {
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b = loadClassData(name);
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} catch (Throwable th) {
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// th.printStackTrace();
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throw new ClassNotFoundException("Loading error", th);
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}
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return defineClass(name, b, 0, b.length);
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}
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private byte[] loadClassData(String name) {
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return switch (name) {
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case INTERFACE_NAME -> ClassFile.of().build(ClassDesc.ofInternalName(INTERFACE_NAME), clb -> {
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clb.withFlags(AccessFlag.ABSTRACT, AccessFlag.INTERFACE, AccessFlag.PUBLIC);
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clb.withSuperclass(CD_Object);
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clb.withMethodBody("privInstance", MethodTypeDesc.of(CD_int), ACC_PRIVATE, cob -> {
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cob.loadConstant(EXPECTED);
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cob.ireturn();
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});
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});
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case CLASS_NAME -> ClassFile.of().build(ClassDesc.of(CLASS_NAME), clb -> {
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clb.withFlags(AccessFlag.PUBLIC);
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clb.withSuperclass(CD_Object);
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clb.withInterfaceSymbols(ClassDesc.ofInternalName(INTERFACE_NAME));
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clb.withMethodBody(INIT_NAME, MTD_void, ACC_PUBLIC, cob -> {
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cob.aload(0);
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cob.invokespecial(CD_Object, INIT_NAME, MTD_void);
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cob.return_();
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});
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});
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default -> throw new IllegalArgumentException();
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};
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}
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}
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public static void main(String[] args) throws Exception {
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TestClassLoader tcl = new TestClassLoader();
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Class<?> itf = tcl.loadClass(INTERFACE_NAME);
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Class<?> k = tcl.loadClass(CLASS_NAME);
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Object inst = k.getDeclaredConstructor().newInstance();
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Method[] meths = itf.getDeclaredMethods();
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if (meths.length != 1) {
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throw new Exception("Expected one method in " + INTERFACE_NAME + " instead " + meths.length);
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}
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Method m = meths[0];
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int mod = m.getModifiers();
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if ((mod & Modifier.PRIVATE) == 0) {
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throw new Exception("Expected " + m + " to be private");
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}
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if ((mod & Modifier.STATIC) != 0) {
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throw new Exception("Expected " + m + " to be instance method");
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}
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m.setAccessible(true);
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for (int i = 1; i < 200; i++) {
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if (!m.invoke(inst).equals(EXPECTED)) {
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throw new Exception("Expected " + EXPECTED + " from " + m);
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}
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}
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System.out.println("Passed.");
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}
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}
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