| /* |
| * Copyright (c) 2018, 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 8200261 |
| * @summary Tests an anonymous class that implements interfaces with default methods. |
| * @library /testlibrary |
| * @modules java.base/jdk.internal.org.objectweb.asm |
| * java.management |
| * @compile -XDignore.symbol.file=true UnsafeDefMeths.java |
| * @run main UnsafeDefMeths |
| */ |
| |
| import jdk.internal.org.objectweb.asm.ClassWriter; |
| import jdk.internal.org.objectweb.asm.MethodVisitor; |
| import jdk.internal.org.objectweb.asm.Type; |
| import sun.misc.Unsafe; |
| |
| import java.lang.invoke.MethodType; |
| import java.lang.reflect.Field; |
| import java.lang.reflect.Method; |
| import java.util.stream.Collectors; |
| import java.util.stream.Stream; |
| |
| import static jdk.internal.org.objectweb.asm.Opcodes.ACC_PRIVATE; |
| import static jdk.internal.org.objectweb.asm.Opcodes.ACC_PUBLIC; |
| import static jdk.internal.org.objectweb.asm.Opcodes.ACC_SUPER; |
| import static jdk.internal.org.objectweb.asm.Opcodes.ALOAD; |
| import static jdk.internal.org.objectweb.asm.Opcodes.ARETURN; |
| import static jdk.internal.org.objectweb.asm.Opcodes.DUP; |
| import static jdk.internal.org.objectweb.asm.Opcodes.GETFIELD; |
| import static jdk.internal.org.objectweb.asm.Opcodes.INVOKESPECIAL; |
| import static jdk.internal.org.objectweb.asm.Opcodes.PUTFIELD; |
| import static jdk.internal.org.objectweb.asm.Opcodes.RETURN; |
| import static jdk.internal.org.objectweb.asm.Opcodes.V1_8; |
| |
| public class UnsafeDefMeths { |
| |
| static final Unsafe UNSAFE; |
| |
| static { |
| try { |
| Field unsafeField = Unsafe.class.getDeclaredField("theUnsafe"); |
| unsafeField.setAccessible(true); |
| UNSAFE = (Unsafe) unsafeField.get(null); |
| } |
| catch (Exception e) { |
| throw new InternalError(e); |
| } |
| } |
| |
| interface Resource { |
| Pointer ptr(); |
| } |
| |
| interface Struct extends Resource { |
| StructPointer ptr(); |
| } |
| |
| interface Pointer { } |
| |
| interface StructPointer extends Pointer { } |
| |
| interface I extends Struct { |
| void m(); |
| } |
| |
| static String IMPL_PREFIX = "$$impl"; |
| static String PTR_FIELD_NAME = "ptr"; |
| |
| public static void main(String[] args) throws Throwable { |
| byte[] bytes = new UnsafeDefMeths().generate(I.class); |
| Class<?> cl = UNSAFE.defineAnonymousClass(I.class, bytes, new Object[0]); |
| I i = (I)cl.getConstructors()[0].newInstance(new Object[] { null }); //exception here! |
| } |
| |
| // Generate a class similar to: |
| // |
| // public class UnsafeDefMeths$I$$impl implements UnsafeDefMeths$I, UnsafeDefMeths$Struct { |
| // |
| // public UnsafeDefMeths$StructPointer ptr; |
| // |
| // public UnsafeDefMeths$I$$impl(UnsafeDefMeths$StructPointer p) { |
| // ptr = p; |
| // } |
| // |
| // public UnsafeDefMeths$StructPointer ptr() { |
| // return ptr; |
| // } |
| // } |
| // |
| byte[] generate(Class<?> iface) { |
| ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS); |
| |
| String ifaceTypeName = Type.getInternalName(iface); |
| String proxyClassName = ifaceTypeName + IMPL_PREFIX; |
| // class definition |
| cw.visit(V1_8, ACC_PUBLIC + ACC_SUPER, proxyClassName, |
| desc(Object.class) + desc(ifaceTypeName) + desc(Struct.class), |
| name(Object.class), |
| new String[] { ifaceTypeName, name(Struct.class) }); |
| |
| cw.visitField(ACC_PUBLIC, PTR_FIELD_NAME, desc(StructPointer.class), desc(StructPointer.class), null); |
| cw.visitEnd(); |
| |
| // constructor |
| MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "<init>", |
| meth(desc(void.class), desc(StructPointer.class)), |
| meth(desc(void.class), desc(StructPointer.class)), null); |
| mv.visitCode(); |
| mv.visitVarInsn(ALOAD, 0); |
| mv.visitInsn(DUP); |
| mv.visitMethodInsn(INVOKESPECIAL, name(Object.class), "<init>", meth(desc(void.class)), false); |
| mv.visitVarInsn(ALOAD, 1); |
| // Execution of this PUTFIELD instruction causes the bug's ClassNotFoundException. |
| mv.visitFieldInsn(PUTFIELD, proxyClassName, PTR_FIELD_NAME, desc(StructPointer.class)); |
| mv.visitInsn(RETURN); |
| mv.visitMaxs(0, 0); |
| mv.visitEnd(); |
| |
| // ptr() impl |
| mv = cw.visitMethod(ACC_PUBLIC, PTR_FIELD_NAME, meth(desc(StructPointer.class)), |
| meth(desc(StructPointer.class)), null); |
| mv.visitCode(); |
| mv.visitVarInsn(ALOAD, 0); |
| mv.visitFieldInsn(GETFIELD, proxyClassName, PTR_FIELD_NAME, desc(StructPointer.class)); |
| mv.visitInsn(ARETURN); |
| mv.visitMaxs(0, 0); |
| mv.visitEnd(); |
| |
| return cw.toByteArray(); |
| } |
| |
| String name(Class<?> clazz) { |
| if (clazz.isPrimitive()) { |
| throw new IllegalStateException(); |
| } else if (clazz.isArray()) { |
| return desc(clazz); |
| } else { |
| return clazz.getName().replaceAll("\\.", "/"); |
| } |
| } |
| |
| String desc(Class<?> clazz) { |
| String mdesc = MethodType.methodType(clazz).toMethodDescriptorString(); |
| return mdesc.substring(mdesc.indexOf(')') + 1); |
| } |
| |
| String desc(String clazzName) { |
| return "L" + clazzName + ";"; |
| } |
| |
| String gen(String clazz, String... typeargs) { |
| return clazz.substring(0, clazz.length() - 1) + Stream.of(typeargs).collect(Collectors.joining("", "<", ">")) + ";"; |
| } |
| |
| String meth(String restype, String... argtypes) { |
| return Stream.of(argtypes).collect(Collectors.joining("", "(", ")")) + restype; |
| } |
| |
| String meth(Method m) { |
| return MethodType.methodType(m.getReturnType(), m.getParameterTypes()).toMethodDescriptorString(); |
| } |
| } |