1 /* 2 * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /** 25 * @test 26 * @bug 8058828 27 * @modules java.base/jdk.internal.org.objectweb.asm 28 * java.base/jdk.internal.misc 29 * 30 * @run main/bootclasspath/othervm -Xbatch compiler.jsr292.VMAnonymousClasses 31 */ 32 33 package compiler.jsr292; 34 35 import jdk.internal.misc.Unsafe; 36 import jdk.internal.org.objectweb.asm.ClassWriter; 37 import jdk.internal.org.objectweb.asm.MethodVisitor; 38 import jdk.internal.org.objectweb.asm.Opcodes; 39 40 import java.lang.invoke.ConstantCallSite; 41 import java.lang.invoke.MethodHandle; 42 import java.lang.invoke.MethodHandles; 43 import java.lang.invoke.MethodType; 44 import java.lang.invoke.MutableCallSite; 45 import java.lang.invoke.VolatileCallSite; 46 47 public class VMAnonymousClasses { 48 static final String TEST_METHOD_NAME = "constant"; 49 50 static final Unsafe UNSAFE = Unsafe.getUnsafe(); 51 52 static int getConstantPoolSize(byte[] classFile) { 53 // The first few bytes: 54 // u4 magic; 55 // u2 minor_version; 56 // u2 major_version; 57 // u2 constant_pool_count; 58 return ((classFile[8] & 0xFF) << 8) | (classFile[9] & 0xFF); 59 } 60 61 static void test(Object value) throws ReflectiveOperationException { 62 System.out.printf("Test: %s", value != null ? value.getClass() : "null"); 63 64 ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES); 65 cw.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC | Opcodes.ACC_SUPER, "Test", null, "java/lang/Object", null); 66 67 MethodVisitor mv = cw.visitMethod(Opcodes.ACC_STATIC | Opcodes.ACC_PUBLIC, TEST_METHOD_NAME, "()Ljava/lang/Object;", null, null); 68 69 String placeholder = "CONSTANT"; 70 int index = cw.newConst(placeholder); 71 mv.visitLdcInsn(placeholder); 72 mv.visitInsn(Opcodes.ARETURN); 73 74 mv.visitMaxs(0, 0); 75 mv.visitEnd(); 76 77 byte[] classFile = cw.toByteArray(); 78 79 Object[] cpPatches = new Object[getConstantPoolSize(classFile)]; 80 cpPatches[index] = value; 81 82 Class<?> test = UNSAFE.defineAnonymousClass(VMAnonymousClasses.class, classFile, cpPatches); 83 84 Object expectedResult = (value != null) ? value : placeholder; 85 for (int i = 0; i<15000; i++) { 86 Object result = test.getMethod(TEST_METHOD_NAME).invoke(null); 87 if (result != expectedResult) { 88 throw new AssertionError(String.format("Wrong value returned: %s != %s", value, result)); 89 } 90 } 91 System.out.println(" PASSED"); 92 } 93 94 public static void main(String[] args) throws ReflectiveOperationException { 95 // Objects 96 test(new Object()); 97 test("TEST"); 98 test(new VMAnonymousClasses()); 99 test(null); 100 101 // Class 102 test(String.class); 103 104 // Arrays 105 test(new boolean[0]); 106 test(new byte[0]); 107 test(new char[0]); 108 test(new short[0]); 109 test(new int[0]); 110 test(new long[0]); 111 test(new float[0]); 112 test(new double[0]); 113 test(new Object[0]); 114 115 // Multi-dimensional arrays 116 test(new byte[0][0]); 117 test(new Object[0][0]); 118 119 // MethodHandle-related 120 MethodType mt = MethodType.methodType(void.class, String[].class); 121 MethodHandle mh = MethodHandles.lookup().findStatic(VMAnonymousClasses.class, "main", mt); 122 test(mt); 123 test(mh); 124 test(new ConstantCallSite(mh)); 125 test(new MutableCallSite(MethodType.methodType(void.class))); 126 test(new VolatileCallSite(MethodType.methodType(void.class))); 127 128 System.out.println("TEST PASSED"); 129 } 130 }