| /* |
| * 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 8046903 |
| * @summary VM anonymous class members can't be statically invocable |
| * @run junit test.java.lang.invoke.VMAnonymousClass |
| */ |
| package test.java.lang.invoke; |
| |
| import java.lang.invoke.MethodHandle; |
| import java.lang.invoke.MethodHandles; |
| import java.lang.invoke.MethodType; |
| import java.lang.reflect.Field; |
| import org.junit.Test; |
| import sun.misc.Unsafe; |
| import jdk.internal.org.objectweb.asm.*; |
| import static jdk.internal.org.objectweb.asm.Opcodes.*; |
| |
| public class VMAnonymousClass { |
| public static void main(String[] args) throws Throwable { |
| VMAnonymousClass test = new VMAnonymousClass(); |
| test.testJavaLang(); |
| test.testJavaUtil(); |
| test.testSunMisc(); |
| test.testJavaLangInvoke(); |
| System.out.println("TEST PASSED"); |
| } |
| |
| // Test VM anonymous classes from different packages |
| // (see j.l.i.InvokerBytecodeGenerator::isStaticallyInvocable). |
| @Test public void testJavaLang() throws Throwable { test("java/lang"); } |
| @Test public void testJavaUtil() throws Throwable { test("java/util"); } |
| @Test public void testSunMisc() throws Throwable { test("sun/misc"); } |
| @Test public void testJavaLangInvoke() throws Throwable { test("java/lang/invoke"); } |
| |
| private static Unsafe unsafe = getUnsafe(); |
| |
| private static void test(String pkg) throws Throwable { |
| byte[] bytes = dumpClass(pkg); |
| // Define VM anonymous class in privileged context (on BCP). |
| Class anonClass = unsafe.defineAnonymousClass(Object.class, bytes, null); |
| |
| MethodType t = MethodType.methodType(Object.class, int.class); |
| MethodHandle target = MethodHandles.lookup().findStatic(anonClass, "get", t); |
| |
| // Wrap target into LF (convert) to get "target" referenced from LF |
| MethodHandle wrappedMH = target.asType(MethodType.methodType(Object.class, Integer.class)); |
| |
| // Invoke enough times to provoke LF compilation to bytecode. |
| for (int i = 0; i<100; i++) { |
| Object r = wrappedMH.invokeExact((Integer)1); |
| } |
| } |
| |
| /* |
| * Constructs bytecode for the following class: |
| * public class pkg.MyClass { |
| * MyClass() {} |
| * public Object get(int i) { return null; } |
| * } |
| */ |
| public static byte[] dumpClass(String pkg) { |
| ClassWriter cw = new ClassWriter(0); |
| MethodVisitor mv; |
| |
| cw.visit(52, ACC_SUPER | ACC_PUBLIC, pkg+"/MyClass", null, "java/lang/Object", null); |
| { |
| mv = cw.visitMethod(0, "<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 + ACC_STATIC, "get", "(I)Ljava/lang/Object;", null, null); |
| mv.visitCode(); |
| mv.visitInsn(ACONST_NULL); |
| mv.visitInsn(ARETURN); |
| mv.visitMaxs(1, 1); |
| mv.visitEnd(); |
| } |
| cw.visitEnd(); |
| return cw.toByteArray(); |
| } |
| |
| private static synchronized Unsafe getUnsafe() { |
| try { |
| Field f = Unsafe.class.getDeclaredField("theUnsafe"); |
| f.setAccessible(true); |
| return (Unsafe) f.get(null); |
| } catch (NoSuchFieldException | IllegalAccessException e) { |
| throw new RuntimeException("Unable to get Unsafe instance.", e); |
| } |
| } |
| } |