144 lines
5.2 KiB
Java
144 lines
5.2 KiB
Java
/*
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* Copyright (c) 2014, 2015, 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 8028553
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* @summary Test that VerifyError is not thrown when 'overriding' a static method.
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* @modules java.base/jdk.internal.org.objectweb.asm
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* @run main FinalStatic
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*/
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import java.lang.reflect.*;
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import jdk.internal.org.objectweb.asm.ClassWriter;
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import jdk.internal.org.objectweb.asm.MethodVisitor;
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import jdk.internal.org.objectweb.asm.Opcodes;
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/*
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* class A { static final int m() {return FAIL; } }
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* class B extends A { int m() { return PASS; } }
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* class FinalStatic {
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* public static void main () {
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* Object b = new B();
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* b.m();
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* }
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* }
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*/
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public class FinalStatic {
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static final String CLASS_NAME_A = "A";
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static final String CLASS_NAME_B = "B";
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static final int FAILED = 0;
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static final int EXPECTED = 1234;
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static class TestClassLoader extends ClassLoader implements Opcodes {
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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) throws Exception {
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ClassWriter cw = new ClassWriter(0);
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MethodVisitor mv;
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switch (name) {
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case CLASS_NAME_A:
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cw.visit(52, ACC_SUPER | ACC_PUBLIC, CLASS_NAME_A, null, "java/lang/Object", null);
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{
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mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
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mv.visitCode();
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mv.visitVarInsn(ALOAD, 0);
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mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
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mv.visitInsn(RETURN);
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mv.visitMaxs(1, 1);
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mv.visitEnd();
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mv = cw.visitMethod(ACC_FINAL | ACC_STATIC, "m", "()I", null, null);
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mv.visitCode();
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mv.visitLdcInsn(FAILED);
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mv.visitInsn(IRETURN);
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mv.visitMaxs(1, 1);
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mv.visitEnd();
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}
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break;
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case CLASS_NAME_B:
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cw.visit(52, ACC_SUPER | ACC_PUBLIC, CLASS_NAME_B, null, CLASS_NAME_A, null);
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{
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mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
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mv.visitCode();
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mv.visitVarInsn(ALOAD, 0);
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mv.visitMethodInsn(INVOKESPECIAL, CLASS_NAME_A, "<init>", "()V");
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mv.visitInsn(RETURN);
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mv.visitMaxs(1, 1);
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mv.visitEnd();
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mv = cw.visitMethod(ACC_PUBLIC, "m", "()I", null, null);
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mv.visitCode();
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mv.visitLdcInsn(EXPECTED);
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mv.visitInsn(IRETURN);
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mv.visitMaxs(1, 1);
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mv.visitEnd();
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}
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break;
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default:
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break;
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}
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cw.visitEnd();
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return cw.toByteArray();
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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<?> a = tcl.loadClass(CLASS_NAME_A);
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Class<?> b = tcl.loadClass(CLASS_NAME_B);
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Object inst = b.newInstance();
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Method[] meths = b.getDeclaredMethods();
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Method m = meths[0];
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int mod = m.getModifiers();
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if ((mod & Modifier.FINAL) != 0) {
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throw new Exception("FAILED: " + m + " is FINAL");
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}
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if ((mod & Modifier.STATIC) != 0) {
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throw new Exception("FAILED: " + m + " is STATIC");
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}
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m.setAccessible(true);
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if (!m.invoke(inst).equals(EXPECTED)) {
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throw new Exception("FAILED: " + EXPECTED + " from " + m);
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}
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System.out.println("Passed.");
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}
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}
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