76 lines
3.2 KiB
Java
76 lines
3.2 KiB
Java
/*
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* Copyright (c) 2019, 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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// This is copied from DefineAnon to test Symbol Refcounting for the package prepended name.
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package p1;
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import jdk.internal.org.objectweb.asm.ClassWriter;
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import jdk.internal.org.objectweb.asm.MethodVisitor;
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import jdk.internal.org.objectweb.asm.Opcodes;
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import jdk.internal.misc.Unsafe;
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class T {
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static protected void test0() { System.out.println("test0 (public)"); }
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static protected void test1() { System.out.println("test1 (protected)"); }
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static /*package-private*/ void test2() { System.out.println("test2 (package)"); }
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static private void test3() { System.out.println("test3 (private)"); }
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}
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public class AnonSymbolLeak {
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private static final Unsafe UNSAFE = Unsafe.getUnsafe();
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static Class<?> getAnonClass(Class<?> hostClass, final String className) {
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final String superName = "java/lang/Object";
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ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);
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cw.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC + Opcodes.ACC_FINAL + Opcodes.ACC_SUPER, className, null, superName, null);
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MethodVisitor mv = cw.visitMethod(Opcodes.ACC_STATIC | Opcodes.ACC_PUBLIC, "test", "()V", null, null);
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mv.visitMethodInsn(Opcodes.INVOKESTATIC, "p1/T", "test0", "()V", false);
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mv.visitMethodInsn(Opcodes.INVOKESTATIC, "p1/T", "test1", "()V", false);
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mv.visitMethodInsn(Opcodes.INVOKESTATIC, "p1/T", "test2", "()V", false);
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mv.visitMethodInsn(Opcodes.INVOKESTATIC, "p1/T", "test3", "()V", false);
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mv.visitInsn(Opcodes.RETURN);
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mv.visitMaxs(0, 0);
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mv.visitEnd();
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final byte[] classBytes = cw.toByteArray();
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Class<?> invokerClass = UNSAFE.defineAnonymousClass(hostClass, classBytes, new Object[0]);
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UNSAFE.ensureClassInitialized(invokerClass);
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return invokerClass;
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}
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public static void test() throws Throwable {
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// AnonClass is injected into package p1.
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System.out.println("Injecting from the same package (p1):");
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Class<?> p1cls = getAnonClass(T.class, "AnonClass");
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p1cls.getMethod("test").invoke(null);
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}
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public static void main(java.lang.String[] unused) throws Throwable {
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test();
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}
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}
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