| /* |
| * Copyright (c) 2014, 2015, 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 8058828 |
| * @modules java.base/jdk.internal.org.objectweb.asm |
| * java.base/jdk.internal.misc |
| * |
| * @run main/bootclasspath/othervm -Xbatch compiler.jsr292.VMAnonymousClasses |
| */ |
| |
| package compiler.jsr292; |
| |
| import jdk.internal.misc.Unsafe; |
| import jdk.internal.org.objectweb.asm.ClassWriter; |
| import jdk.internal.org.objectweb.asm.MethodVisitor; |
| import jdk.internal.org.objectweb.asm.Opcodes; |
| |
| import java.lang.invoke.ConstantCallSite; |
| import java.lang.invoke.MethodHandle; |
| import java.lang.invoke.MethodHandles; |
| import java.lang.invoke.MethodType; |
| import java.lang.invoke.MutableCallSite; |
| import java.lang.invoke.VolatileCallSite; |
| |
| public class VMAnonymousClasses { |
| static final String TEST_METHOD_NAME = "constant"; |
| |
| static final Unsafe UNSAFE = Unsafe.getUnsafe(); |
| |
| static int getConstantPoolSize(byte[] classFile) { |
| // The first few bytes: |
| // u4 magic; |
| // u2 minor_version; |
| // u2 major_version; |
| // u2 constant_pool_count; |
| return ((classFile[8] & 0xFF) << 8) | (classFile[9] & 0xFF); |
| } |
| |
| static void test(Object value) throws ReflectiveOperationException { |
| System.out.printf("Test: %s", value != null ? value.getClass() : "null"); |
| |
| ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES); |
| cw.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC | Opcodes.ACC_SUPER, "Test", null, "java/lang/Object", null); |
| |
| MethodVisitor mv = cw.visitMethod(Opcodes.ACC_STATIC | Opcodes.ACC_PUBLIC, TEST_METHOD_NAME, "()Ljava/lang/Object;", null, null); |
| |
| String placeholder = "CONSTANT"; |
| int index = cw.newConst(placeholder); |
| mv.visitLdcInsn(placeholder); |
| mv.visitInsn(Opcodes.ARETURN); |
| |
| mv.visitMaxs(0, 0); |
| mv.visitEnd(); |
| |
| byte[] classFile = cw.toByteArray(); |
| |
| Object[] cpPatches = new Object[getConstantPoolSize(classFile)]; |
| cpPatches[index] = value; |
| |
| Class<?> test = UNSAFE.defineAnonymousClass(VMAnonymousClasses.class, classFile, cpPatches); |
| |
| Object expectedResult = (value != null) ? value : placeholder; |
| for (int i = 0; i<15000; i++) { |
| Object result = test.getMethod(TEST_METHOD_NAME).invoke(null); |
| if (result != expectedResult) { |
| throw new AssertionError(String.format("Wrong value returned: %s != %s", value, result)); |
| } |
| } |
| System.out.println(" PASSED"); |
| } |
| |
| public static void main(String[] args) throws ReflectiveOperationException { |
| // Objects |
| test(new Object()); |
| test("TEST"); |
| test(new VMAnonymousClasses()); |
| test(null); |
| |
| // Class |
| test(String.class); |
| |
| // Arrays |
| test(new boolean[0]); |
| test(new byte[0]); |
| test(new char[0]); |
| test(new short[0]); |
| test(new int[0]); |
| test(new long[0]); |
| test(new float[0]); |
| test(new double[0]); |
| test(new Object[0]); |
| |
| // Multi-dimensional arrays |
| test(new byte[0][0]); |
| test(new Object[0][0]); |
| |
| // MethodHandle-related |
| MethodType mt = MethodType.methodType(void.class, String[].class); |
| MethodHandle mh = MethodHandles.lookup().findStatic(VMAnonymousClasses.class, "main", mt); |
| test(mt); |
| test(mh); |
| test(new ConstantCallSite(mh)); |
| test(new MutableCallSite(MethodType.methodType(void.class))); |
| test(new VolatileCallSite(MethodType.methodType(void.class))); |
| |
| System.out.println("TEST PASSED"); |
| } |
| } |