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* 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.
*
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*/
/*
* @test
* @bug 8032010
* @summary method lookup on an abstract method in a concrete class should be successful
* @modules java.base/jdk.internal.org.objectweb.asm
* @run main TestConcreteClassWithAbstractMethod
*/
import jdk.internal.org.objectweb.asm.ClassWriter;
import jdk.internal.org.objectweb.asm.MethodVisitor;
import static jdk.internal.org.objectweb.asm.Opcodes.*;
/*
* class T1 { public int m() {} }
* class T2 { public abstract int m(); }
* class T3 { public int m() {} }
*
* Call site: T3.test() { invokevirtual T2.m() }
* T3.m() should be invoked
*/
public class TestConcreteClassWithAbstractMethod {
static final String classT1 = "p1.T1";
static final String classT2 = "p1.T2";
static final String classT3 = "p1.T3";
static final String callerName = classT3;
public static void main(String[] args) throws Exception {
ClassLoader cl = new ClassLoader() {
public Class<?> loadClass(String name) throws ClassNotFoundException {
if (findLoadedClass(name) != null) {
return findLoadedClass(name);
}
if (classT1.equals(name)) {
byte[] classFile = dumpT1();
return defineClass(classT1, classFile, 0, classFile.length);
}
if (classT2.equals(name)) {
byte[] classFile = dumpT2();
return defineClass(classT2, classFile, 0, classFile.length);
}
if (classT3.equals(name)) {
byte[] classFile = dumpT3();
return defineClass(classT3, classFile, 0, classFile.length);
}
return super.loadClass(name);
}
};
cl.loadClass(classT1);
cl.loadClass(classT2);
cl.loadClass(classT3);
//cl.loadClass(callerName).getDeclaredMethod("m");
cl.loadClass(callerName).newInstance();
int result = (Integer)cl.loadClass(callerName).getDeclaredMethod("test").invoke(null);
System.out.println(""+result);
}
public static byte[] dumpT1() {
ClassWriter cw = new ClassWriter(0);
MethodVisitor mv;
cw.visit(52, ACC_PUBLIC | ACC_SUPER, "p1/T1", 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", false);
mv.visitInsn(RETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
{
mv = cw.visitMethod(ACC_PUBLIC, "m", "()I", null, null);
mv.visitCode();
mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
mv.visitLdcInsn("p1/T1.m()");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "print", "(Ljava/lang/String;)V", false);
mv.visitIntInsn(BIPUSH, 3);
mv.visitInsn(IRETURN);
mv.visitMaxs(2, 1);
mv.visitEnd();
}
cw.visitEnd();
return cw.toByteArray();
}
public static byte[] dumpT2() {
ClassWriter cw = new ClassWriter(0);
MethodVisitor mv;
cw.visit(52, ACC_PUBLIC | ACC_SUPER, "p1/T2", null, "p1/T1", null);
{
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "p1/T1", "<init>", "()V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
{
mv = cw.visitMethod(ACC_PUBLIC + ACC_ABSTRACT, "m", "()I", null, null);
mv.visitEnd();
}
cw.visitEnd();
return cw.toByteArray();
}
public static byte[] dumpT3() {
ClassWriter cw = new ClassWriter(0);
MethodVisitor mv;
cw.visit(52, ACC_PUBLIC + ACC_SUPER, "p1/T3", null, "p1/T2", null);
{
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "p1/T2", "<init>", "()V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
{
mv = cw.visitMethod(ACC_PUBLIC, "m", "()I", null, null);
mv.visitCode();
mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
mv.visitLdcInsn("p1/T3.m()");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "print", "(Ljava/lang/String;)V", false);
mv.visitIntInsn(BIPUSH, 2);
mv.visitInsn(IRETURN);
mv.visitMaxs(2, 1);
mv.visitEnd();
}
{
mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "test", "()I", null, null);
mv.visitCode();
mv.visitTypeInsn(NEW, "p1/T3");
mv.visitInsn(DUP);
mv.visitMethodInsn(INVOKESPECIAL, "p1/T3", "<init>", "()V", false);
mv.visitMethodInsn(INVOKEVIRTUAL, "p1/T2", "m", "()I", false);
mv.visitInsn(IRETURN);
mv.visitMaxs(3, 2);
mv.visitEnd();
}
cw.visitEnd();
return cw.toByteArray();
}
}