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