| /* |
| * Copyright (c) 2014, 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 8032400 |
| * @summary JSR292: invokeSpecial: InternalError attempting to lookup a method |
| * @modules java.base/jdk.internal.org.objectweb.asm |
| * @compile -XDignore.symbol.file SpecialStatic.java |
| * @run junit test.java.lang.invoke.lookup.SpecialStatic |
| */ |
| package test.java.lang.invoke.lookup; |
| |
| import java.lang.invoke.MethodHandle; |
| import java.lang.invoke.MethodHandles; |
| import java.lang.invoke.MethodType; |
| import jdk.internal.org.objectweb.asm.*; |
| import org.junit.Test; |
| import static jdk.internal.org.objectweb.asm.Opcodes.*; |
| import static org.junit.Assert.*; |
| |
| /** |
| * Test case: |
| * class T1 { int m() { return 1; }} |
| * class T2 extends T1 { static int m() { return 2; }} |
| * class T3 extends T2 { int m() { return 3; }} |
| * |
| * T3::test { invokespecial T1.m() T3 } ==> T1::m |
| */ |
| public class SpecialStatic { |
| static class CustomClassLoader extends ClassLoader { |
| public Class<?> loadClass(String name) throws ClassNotFoundException { |
| if (findLoadedClass(name) != null) { |
| return findLoadedClass(name); |
| } |
| |
| if ("T1".equals(name)) { |
| byte[] classFile = dumpT1(); |
| return defineClass("T1", classFile, 0, classFile.length); |
| } |
| if ("T2".equals(name)) { |
| byte[] classFile = dumpT2(); |
| return defineClass("T2", classFile, 0, classFile.length); |
| } |
| if ("T3".equals(name)) { |
| byte[] classFile = dumpT3(); |
| return defineClass("T3", classFile, 0, classFile.length); |
| } |
| |
| return super.loadClass(name); |
| } |
| } |
| |
| private static ClassLoader cl = new CustomClassLoader(); |
| private static Class t1, t3; |
| static { |
| try { |
| t1 = cl.loadClass("T1"); |
| t3 = cl.loadClass("T3"); |
| } catch (ClassNotFoundException e) { |
| throw new Error(e); |
| } |
| } |
| |
| public static void main(String[] args) throws Throwable { |
| SpecialStatic test = new SpecialStatic(); |
| test.testConstant(); |
| test.testFindSpecial(); |
| } |
| |
| @Test |
| public void testConstant() throws Throwable { |
| MethodHandle mh = (MethodHandle)t3.getDeclaredMethod("getMethodHandle").invoke(null); |
| int result = (int)mh.invoke(t3.newInstance()); |
| assertEquals(result, 1); // T1.m should be invoked. |
| } |
| |
| @Test |
| public void testFindSpecial() throws Throwable { |
| MethodHandles.Lookup lookup = (MethodHandles.Lookup)t3.getDeclaredMethod("getLookup").invoke(null); |
| MethodHandle mh = lookup.findSpecial(t1, "m", MethodType.methodType(int.class), t3); |
| int result = (int)mh.invoke(t3.newInstance()); |
| assertEquals(result, 1); // T1.m should be invoked. |
| } |
| |
| public static byte[] dumpT1() { |
| ClassWriter cw = new ClassWriter(0); |
| MethodVisitor mv; |
| |
| cw.visit(52, ACC_PUBLIC + ACC_SUPER, "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.visitIntInsn(BIPUSH, 1); |
| mv.visitInsn(IRETURN); |
| mv.visitMaxs(1, 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, "T2", null, "T1", null); |
| |
| mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null); |
| mv.visitCode(); |
| mv.visitVarInsn(ALOAD, 0); |
| mv.visitMethodInsn(INVOKESPECIAL, "T1", "<init>", "()V", false); |
| mv.visitInsn(RETURN); |
| mv.visitMaxs(1, 1); |
| mv.visitEnd(); |
| |
| mv = cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "m", "()I", null, null); |
| mv.visitCode(); |
| mv.visitIntInsn(BIPUSH, 2); |
| mv.visitInsn(IRETURN); |
| mv.visitMaxs(1, 1); |
| 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, "T3", null, "T2", null); |
| |
| mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null); |
| mv.visitCode(); |
| mv.visitVarInsn(ALOAD, 0); |
| mv.visitMethodInsn(INVOKESPECIAL, "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.visitIntInsn(BIPUSH, 3); |
| mv.visitInsn(IRETURN); |
| mv.visitMaxs(1, 1); |
| mv.visitEnd(); |
| |
| // getMethodHandle |
| mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "getMethodHandle", "()Ljava/lang/invoke/MethodHandle;", null, null); |
| mv.visitCode(); |
| mv.visitLdcInsn(new Handle(H_INVOKESPECIAL, "T1", "m", "()I")); |
| mv.visitInsn(ARETURN); |
| mv.visitMaxs(1, 0); |
| mv.visitEnd(); |
| |
| // getLookup |
| mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "getLookup", "()Ljava/lang/invoke/MethodHandles$Lookup;", null, null); |
| mv.visitCode(); |
| mv.visitMethodInsn(INVOKESTATIC, "java/lang/invoke/MethodHandles", "lookup", "()Ljava/lang/invoke/MethodHandles$Lookup;", false); |
| mv.visitInsn(ARETURN); |
| mv.visitMaxs(1, 0); |
| mv.visitEnd(); |
| |
| cw.visitEnd(); |
| return cw.toByteArray(); |
| } |
| } |