vlivanov@7288: /*
vlivanov@7288:  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
vlivanov@7288:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
vlivanov@7288:  *
vlivanov@7288:  * This code is free software; you can redistribute it and/or modify it
vlivanov@7288:  * under the terms of the GNU General Public License version 2 only, as
vlivanov@7288:  * published by the Free Software Foundation.
vlivanov@7288:  *
vlivanov@7288:  * This code is distributed in the hope that it will be useful, but WITHOUT
vlivanov@7288:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
vlivanov@7288:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
vlivanov@7288:  * version 2 for more details (a copy is included in the LICENSE file that
vlivanov@7288:  * accompanied this code).
vlivanov@7288:  *
vlivanov@7288:  * You should have received a copy of the GNU General Public License version
vlivanov@7288:  * 2 along with this work; if not, write to the Free Software Foundation,
vlivanov@7288:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
vlivanov@7288:  *
vlivanov@7288:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
vlivanov@7288:  * or visit www.oracle.com if you need additional information or have any
vlivanov@7288:  * questions.
vlivanov@7288:  */
vlivanov@7288: 
vlivanov@7288: /**
vlivanov@7288:  * @test
vlivanov@7288:  * @bug 8058828
vlivanov@7288:  * @run main/bootclasspath -Xbatch VMAnonymousClasses
vlivanov@7288:  */
vlivanov@7288: 
vlivanov@7288: import jdk.internal.org.objectweb.asm.ClassWriter;
vlivanov@7288: import jdk.internal.org.objectweb.asm.MethodVisitor;
vlivanov@7288: import jdk.internal.org.objectweb.asm.Opcodes;
vlivanov@7288: import sun.misc.Unsafe;
vlivanov@7288: 
vlivanov@7288: import java.lang.invoke.ConstantCallSite;
vlivanov@7288: import java.lang.invoke.MethodHandle;
vlivanov@7288: import java.lang.invoke.MethodHandles;
vlivanov@7288: import java.lang.invoke.MethodType;
vlivanov@7288: import java.lang.invoke.MutableCallSite;
vlivanov@7288: import java.lang.invoke.VolatileCallSite;
vlivanov@7288: 
vlivanov@7288: public class VMAnonymousClasses {
vlivanov@7288:     static final String TEST_METHOD_NAME = "constant";
vlivanov@7288: 
vlivanov@7288:     static final Unsafe UNSAFE = Unsafe.getUnsafe();
vlivanov@7288: 
vlivanov@7288:     static int getConstantPoolSize(byte[] classFile) {
vlivanov@7288:         // The first few bytes:
vlivanov@7288:         // u4 magic;
vlivanov@7288:         // u2 minor_version;
vlivanov@7288:         // u2 major_version;
vlivanov@7288:         // u2 constant_pool_count;
vlivanov@7288:         return ((classFile[8] & 0xFF) << 8) | (classFile[9] & 0xFF);
vlivanov@7288:     }
vlivanov@7288: 
vlivanov@7288:     static void test(Object value) throws ReflectiveOperationException {
vlivanov@7288:         System.out.printf("Test: %s", value != null ? value.getClass() : "null");
vlivanov@7288: 
vlivanov@7288:         ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
vlivanov@7288:         cw.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC | Opcodes.ACC_SUPER, "Test", null, "java/lang/Object", null);
vlivanov@7288: 
vlivanov@7288:         MethodVisitor mv = cw.visitMethod(Opcodes.ACC_STATIC | Opcodes.ACC_PUBLIC, TEST_METHOD_NAME, "()Ljava/lang/Object;", null, null);
vlivanov@7288: 
vlivanov@7288:         String placeholder = "CONSTANT";
vlivanov@7288:         int index = cw.newConst(placeholder);
vlivanov@7288:         mv.visitLdcInsn(placeholder);
vlivanov@7288:         mv.visitInsn(Opcodes.ARETURN);
vlivanov@7288: 
vlivanov@7288:         mv.visitMaxs(0, 0);
vlivanov@7288:         mv.visitEnd();
vlivanov@7288: 
vlivanov@7288:         byte[] classFile = cw.toByteArray();
vlivanov@7288: 
vlivanov@7288:         Object[] cpPatches = new Object[getConstantPoolSize(classFile)];
vlivanov@7288:         cpPatches[index] = value;
vlivanov@7288: 
vlivanov@7288:         Class<?> test = UNSAFE.defineAnonymousClass(VMAnonymousClasses.class, classFile, cpPatches);
vlivanov@7288: 
vlivanov@7288:         Object expectedResult = (value != null) ? value : placeholder;
vlivanov@7288:         for (int i = 0; i<15000; i++) {
vlivanov@7288:             Object result = test.getMethod(TEST_METHOD_NAME).invoke(null);
vlivanov@7288:             if (result != expectedResult) {
vlivanov@7288:                 throw new AssertionError(String.format("Wrong value returned: %s != %s", value, result));
vlivanov@7288:             }
vlivanov@7288:         }
vlivanov@7288:         System.out.println(" PASSED");
vlivanov@7288:     }
vlivanov@7288: 
vlivanov@7288:     public static void main(String[] args) throws ReflectiveOperationException  {
vlivanov@7288:         // Objects
vlivanov@7288:         test(new Object());
vlivanov@7288:         test("TEST");
vlivanov@7288:         test(new VMAnonymousClasses());
vlivanov@7288:         test(null);
vlivanov@7288: 
vlivanov@7288:         // Class
vlivanov@7288:         test(String.class);
vlivanov@7288: 
vlivanov@7288:         // Arrays
vlivanov@7288:         test(new boolean[0]);
vlivanov@7288:         test(new byte[0]);
vlivanov@7288:         test(new char[0]);
vlivanov@7288:         test(new short[0]);
vlivanov@7288:         test(new int[0]);
vlivanov@7288:         test(new long[0]);
vlivanov@7288:         test(new float[0]);
vlivanov@7288:         test(new double[0]);
vlivanov@7288:         test(new Object[0]);
vlivanov@7288: 
vlivanov@7288:         // Multi-dimensional arrays
vlivanov@7288:         test(new byte[0][0]);
vlivanov@7288:         test(new Object[0][0]);
vlivanov@7288: 
vlivanov@7288:         // MethodHandle-related
vlivanov@7288:         MethodType   mt = MethodType.methodType(void.class, String[].class);
vlivanov@7288:         MethodHandle mh = MethodHandles.lookup().findStatic(VMAnonymousClasses.class, "main", mt);
vlivanov@7288:         test(mt);
vlivanov@7288:         test(mh);
vlivanov@7288:         test(new ConstantCallSite(mh));
vlivanov@7288:         test(new MutableCallSite(MethodType.methodType(void.class)));
vlivanov@7288:         test(new VolatileCallSite(MethodType.methodType(void.class)));
vlivanov@7288: 
vlivanov@7288:         System.out.println("TEST PASSED");
vlivanov@7288:     }
vlivanov@7288: }