author | acorn |
Wed, 27 Jul 2016 08:33:15 -0400 | |
changeset 40193 | 1de2394fd836 |
parent 36966 | 4209c9e19c45 |
child 40964 | c4a7c6d1cfb3 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2014, 2016, 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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/* @test |
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* @bug 8046903 |
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* @summary VM anonymous class members can't be statically invocable |
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* @modules java.base/jdk.internal.misc java.base/jdk.internal.org.objectweb.asm |
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* @run junit test.java.lang.invoke.VMAnonymousClass |
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*/ |
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package test.java.lang.invoke; |
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|
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import java.lang.invoke.MethodHandle; |
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import java.lang.invoke.MethodHandles; |
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import java.lang.invoke.MethodType; |
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import java.lang.reflect.Field; |
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import org.junit.Test; |
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import jdk.internal.misc.Unsafe; |
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import jdk.internal.org.objectweb.asm.*; |
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import static jdk.internal.org.objectweb.asm.Opcodes.*; |
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public class VMAnonymousClass { |
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public static void main(String[] args) throws Throwable { |
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VMAnonymousClass test = new VMAnonymousClass(); |
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test.testJavaLang(); |
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test.testJavaUtil(); |
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test.testJdkInternalMisc(); |
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test.testJavaLangInvoke(); |
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test.testProhibitedJavaPkg(); |
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System.out.println("TEST PASSED"); |
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} |
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// Test VM anonymous classes from different packages |
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// (see j.l.i.InvokerBytecodeGenerator::isStaticallyInvocable). |
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@Test public void testJavaLang() throws Throwable { test("java/lang"); } |
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@Test public void testJavaUtil() throws Throwable { test("java/util"); } |
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@Test public void testJdkInternalMisc() throws Throwable { test("jdk/internal/misc"); } |
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@Test public void testJavaLangInvoke() throws Throwable { test("java/lang/invoke"); } |
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@Test public void testProhibitedJavaPkg() throws Throwable { |
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try { |
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test("java/prohibited"); |
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} catch (SecurityException e) { |
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return; |
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} |
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throw new RuntimeException("Expected SecurityException"); |
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} |
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private static Unsafe unsafe = getUnsafe(); |
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private static void test(String pkg) throws Throwable { |
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byte[] bytes = dumpClass(pkg); |
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Class host_class; |
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if (pkg.equals("java/prohibited")) { |
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VMAnonymousClass sampleclass = new VMAnonymousClass(); |
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host_class = (Class)sampleclass.getClass(); |
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} else { |
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host_class = Object.class; |
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} |
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||
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// Define VM anonymous class |
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Class anonClass = unsafe.defineAnonymousClass(host_class, bytes, null); |
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MethodType t = MethodType.methodType(Object.class, int.class); |
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MethodHandle target = MethodHandles.lookup().findStatic(anonClass, "get", t); |
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// Wrap target into LF (convert) to get "target" referenced from LF |
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MethodHandle wrappedMH = target.asType(MethodType.methodType(Object.class, Integer.class)); |
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// Invoke enough times to provoke LF compilation to bytecode. |
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for (int i = 0; i<100; i++) { |
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Object r = wrappedMH.invokeExact((Integer)1); |
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} |
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} |
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/* |
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* Constructs bytecode for the following class: |
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* public class pkg.MyClass { |
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* MyClass() {} |
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* public Object get(int i) { return null; } |
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* } |
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*/ |
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public static byte[] dumpClass(String pkg) { |
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ClassWriter cw = new ClassWriter(0); |
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MethodVisitor mv; |
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cw.visit(52, ACC_SUPER | ACC_PUBLIC, pkg+"/MyClass", null, "java/lang/Object", null); |
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{ |
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mv = cw.visitMethod(0, "<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", false); |
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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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} |
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{ |
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mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "get", "(I)Ljava/lang/Object;", null, null); |
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mv.visitCode(); |
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mv.visitInsn(ACONST_NULL); |
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mv.visitInsn(ARETURN); |
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mv.visitMaxs(1, 1); |
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mv.visitEnd(); |
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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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private static synchronized Unsafe getUnsafe() { |
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try { |
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Field f = Unsafe.class.getDeclaredField("theUnsafe"); |
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f.setAccessible(true); |
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return (Unsafe) f.get(null); |
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} catch (NoSuchFieldException | IllegalAccessException e) { |
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throw new RuntimeException("Unable to get Unsafe instance.", e); |
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} |
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} |
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} |